What Is Caused By Earthquakes And Their Global Impacts

Primary Geological Effects of Earthquakes

The propagation of seismic waves follows distinct physical principles that dictate their destructive potential. P-waves (primary waves), the fastest seismic waves, compress and expand materials parallel to their direction of travel, causing initial ground shaking. S-waves (secondary waves), slower but more destructive, shear materials perpendicularly, amplifying structural damage. Surface waves, including Love waves (horizontal shear) and Rayleigh waves (elliptical motion), exacerbate ground displacement near the surface, particularly in unconsolidated sediments. These interactions are further modulated by wave amplification in soft soils, where low-frequency waves resonate with sediment layers, increasing shaking intensity. For instance, the 1985 Mexico City earthquake (M8.0) demonstrated how basin sediments amplified seismic energy, leading to catastrophic collapse despite the epicenter being 350 km away.

Mechanisms of Seismic Wave Propagation and Tectonic Impact

The seismic moment (M₀), defined as the product of rigidity, rupture area, and average slip, quantifies the total energy released. For example, the 2004 Sumatra-Andaman earthquake (M9.1–9.3) had a seismic moment of ~4.0 × 10²² Nm, reflecting a rupture length of ~1,300 km and an average slip of 15 meters.

Surface Ruptures, Ground Cracks, and Subsidence

Ground cracks form due to:

Subsidence occurs when the ground surface lowers due to:

Comparison of Primary Geological Effects

Visualization of Seismic Wave Interactions with Geological Materials

Bedrock Response (High Rigidity, Low Damping)

P-waves and S-waves travel efficiently with minimal attenuation.

Surface waves (Love/Rayleigh) propagate with reduced amplitude due to high shear strength.

Example: Granitic or volcanic bedrock in mountainous regions (e.g., Sierra Nevada) experiences less amplification but can generate high-frequency shaking, damaging rigid structures.

Unconsolidated Sediments (Low Rigidity, High Damping)

P-waves slow down and refract, while S-waves attenuate rapidly.

Surface waves amplify due to basin effects, where soft sediments trap and resonate low-frequency energy.

Liquefaction zones: Loose sands or silts lose strength, causing sand boils and

Human-Made Infrastructure Damage from Earthquakes

Earthquakes induce catastrophic failures in human-made infrastructure through seismic forces that exceed structural design thresholds, leading to cascading societal and economic disruptions. The most vulnerable systems—buildings, bridges, and pipelines—often exhibit predictable failure modes tied to engineering flaws, material limitations, or inadequate seismic retrofitting. Case studies, such as the 2011 Christchurch liquefaction disaster and the 2010 Haiti building collapses, demonstrate how localized failures can trigger secondary hazards like fires, landslides, or utility disruptions. Mitigation strategies, including base isolation, shear wall reinforcement, and updated building codes, have evolved in response to these failures, yet their effectiveness varies by region due to enforcement challenges and resource constraints.

Structural Vulnerabilities in Buildings

Seismic forces disproportionately affect buildings due to their vertical load-bearing systems, which are often ill-equipped to resist lateral accelerations. Soft-story collapses—where the first floor of a multi-story structure fails due to weak columns or large openings (e.g., parking garages)—are a leading cause of fatalities. Shear wall inadequacies in unreinforced masonry or poorly detailed reinforced concrete further exacerbate risks, as these walls fail under cyclic loading. Non-ductile concrete frames, prevalent in older constructions, lack the ability to dissipate energy through controlled deformation, leading to brittle failures. Wood-frame structures, while flexible, suffer from diaphragm failures when roof or floor systems disconnect from load-bearing walls, causing progressive collapse.

Key vulnerabilities include:

Unreinforced masonry (URM): Prone to out-of-plane failures under horizontal shaking, as seen in the 2010 Haiti earthquake, where 70% of collapses involved URM structures.

Soft-story configurations: Common in urban areas with commercial ground floors (e.g., 1994 Northridge earthquake, where 30% of apartment building collapses occurred in soft-story buildings).

Poor foundation-soil interaction: Structures on liquefiable soils (e.g., Christchurch 2011) experience excessive settlement or tilting, rendering them unusable even if the superstructure remains intact.

"Structural failure in earthquakes is rarely a single-point event; it is a cascading process where one component’s collapse triggers secondary failures in adjacent or dependent systems."
— FEMA P-750, "NEHRP Guidelines for Seismic Rehabilitation of Buildings (2009)

Bridges and Transportation Infrastructure Failures

Bridges are critical lifelines that often fail at bearings, columns, or expansion joints due to seismic demands exceeding design assumptions. Fixed bearings—designed to resist vertical loads but not lateral displacement—can shear off, causing superstructure collapse (e.g., 1989 Loma Prieta earthquake, where the Cypress Street Viaduct failed due to unseated girders). Column failures in reinforced concrete bridges occur when lateral forces induce shear cracking or pounding (collision between adjacent spans), as observed in the 1995 Kobe earthquake, where 20% of bridges suffered severe damage.

Key failure mechanisms include:

Unseating of deck segments: Lack of seismic restraints allows decks to slide off supports, disrupting traffic and emergency access.

Pounding between adjacent spans: Insufficient clearances between bridge segments lead to impact forces (e.g., 1999 İzmit earthquake, where the Yalova Bridge collapsed due to span collision).

Abutment scour and liquefaction: Soil liquefaction undermines bridge foundations, causing tilting or sinking (e.g., 2011 Tōhoku earthquake, where coastal bridges settled into liquefied ground).

"Bridge design must account for not just the earthquake’s peak ground acceleration, but also the duration of shaking, as prolonged vibrations can induce fatigue failures in steel components."
— AASHTO Guide Specifications for Seismic Design of Highway Bridges (2014)

Pipeline and Utility System Failures

Pipelines for water, gas, and oil are susceptible to ground rupture, liquefaction, or excessive strain during earthquakes. Water main ruptures (e.g., 1994 Northridge earthquake, where 1,500 breaks occurred) disrupt firefighting efforts and public access to potable water. Gas pipeline failures pose explosion risks, as seen in the 2016 Kaikōura earthquake, where ruptures ignited fires in residential areas. Electricity transmission lines collapse due to pole foundation failures or conductor whipping, leading to prolonged blackouts (e.g., 2010 Chile earthquake, where 90% of Santiago lost power).

Failure modes include:

Ground deformation-induced strains: Pipelines crossing faults or liquefaction zones experience axial elongation or buckling (e.g., 1995 Kobe earthquake, where 1,000 gas pipeline breaks occurred).

Joint separation: Poorly anchored pipeline joints disconnect under seismic shaking, causing leaks or ruptures.

Backfill liquefaction: Buried pipelines lose lateral support, leading to floating or sinking (e.g., 2011 Christchurch earthquake, where 150 km of water pipes failed).

"Utility systems must be designed with redundancy and isolation to ensure that a single failure does not cascade into a regional outage. Post-earthquake restoration prioritizes water and gas systems to prevent secondary hazards like fires or disease outbreaks."
— ASCE 7-16, Minimum Design Loads for Buildings and Other Structures

Case Studies of Infrastructure Failures and Cascading Consequences

Structure Type	Failure Mode	Seismic Load Threshold	Mitigation Strategy
Unreinforced Masonry Buildings	Out-of-plane wall collapse, progressive roof failure	0.2–0.4g (moderate shaking)	Shear wall reinforcement, steel ties, or demolition/replacement (e.g., Haiti 2010 retrofit programs)
Soft-Story Apartment Buildings	First-floor column shear failure, diaphragm separation	0.3–0.6g (strong shaking)	Base isolation, added shear walls, or soft-story retrofitting (e.g., Los Angeles’ 2020 ordinance)
Reinforced Concrete Bridges	Column shear failure, unseating of decks	0.4–0.8g (with liquefaction)	Seismic joints, elastomeric bearings, or cap-and-strap retrofitting (e.g., California’s SB 1953)
Steel-Frame High-Rises	Beam-column joint fracture, story mechanism formation	0.5–1.0g (rare but catastrophic)	Buckling-restrained braces, viscoelastic dampers (e.g., Tokyo’s Shinkansen Station retrofits)
Buried Pipelines (Water/Gas)	Axial rupture, joint separation, liquefaction-induced floatation	0.1–0.3g (ground deformation-sensitive)	Flexible joints, floating pipe systems (e.g., Japan’s seismic pipeline codes), or trenchless repairs

Cascading consequences from these failures include:

Fires: Ruptured gas lines and disrupted water supplies (e.g., 1906 San Francisco earthquake, where 80% of fires stemmed from broken gas mains).

Landslides and debris flows: Damaged roads and pipelines exacerbate slope instability (e.g., 2015 Nepal earthquake, where 3,000 landslides blocked critical access routes).

Economic paralysis: Infrastructure damage in 2011 Tōhoku cost $360 billion, with bridge and port failures halting trade for months.

Role of Building Codes in Mitigating Earthquake Damage

Modern seismic design codes—such as the International Building Code (IBC), Eurocode 8 (EC8),

Environmental and Ecological Consequences of Earthquakes

Earthquakes disrupt natural systems beyond immediate ground shaking, triggering cascading secondary hazards that reshape landscapes and ecosystems. These consequences often persist for decades, altering biodiversity, water cycles, and geological stability. Secondary effects—such as landslides, tsunamis, and volcanic eruptions—exacerbate ecological damage, while long-term impacts like soil contamination and altered hydrology further strain recovery. Geographic case studies illustrate how seismic events interact with regional geology to produce distinct environmental outcomes, from the 2008 Sichuan landslides that buried entire valleys to the 2011 Tōhoku earthquake’s induction of volcanic activity along Japan’s Pacific coast.

The interplay between seismic energy and environmental systems creates feedback loops that amplify ecological disruption. For instance, ground deformation can redirect river flows, while ruptured infrastructure releases pollutants into fragile habitats. Understanding these processes is critical for assessing recovery potential and designing mitigation strategies in earthquake-prone regions.

Secondary Hazards Triggered by Earthquakes

Earthquakes initiate secondary hazards that often surpass primary ground motion in ecological and human impact. These events are influenced by seismic intensity, topography, and local geology. Landslides, for example, occur when seismic waves destabilize slopes, particularly in mountainous or steep terrain. The 2008 Mw 7.9 Sichuan earthquake in China triggered over 56,000 landslides, burying villages and blocking rivers, which in turn created quake lakes—ephemeral water bodies prone to catastrophic dam failures. Similarly, avalanches are common in high-altitude regions, such as the 2015 Nepal earthquake, where seismic shaking released glacial ice and snow, burying remote settlements.

Volcanic eruptions can also be induced by earthquakes, particularly in subduction zones where tectonic stress alters magma pathways. The 2011 Tōhoku earthquake (Mw 9.0) triggered phreatic eruptions at Mount Nakadake in Japan’s Akan Volcanic Complex, attributed to crustal deformation and pressure changes in hydrothermal systems. In contrast, the 1960 Valdivia earthquake (Mw 9.5) in Chile induced volcanic activity along the Andes, including the Puyehue-Cordón Caulle eruption, demonstrating how large seismic events can reactivate dormant volcanoes.

Tsunamis, though primarily oceanic hazards, also interact with coastal ecosystems. The 2004 Indian Ocean tsunami inundated mangrove forests, which act as natural buffers, but also deposited sediment that smothered coral reefs and seagrass beds. These secondary effects disrupt marine food webs and reduce coastal resilience to future storms.

Long-Term Ecological Impacts

Beyond immediate destruction, earthquakes induce persistent ecological changes that reshape habitats and species distributions. Habitat fragmentation occurs when seismic activity alters terrain, isolating populations and reducing genetic diversity. For example, the 1994 Northridge earthquake in California created fault scarps that severed wildlife corridors, forcing species like the mountain lion to adapt to fragmented landscapes. Soil contamination further degrades ecosystems; ruptured gas pipelines during the 2016 Kaikōura earthquake in New Zealand released hydrocarbons into rivers, poisoning aquatic life and reducing water quality for decades.

Ground deformation also disrupts hydrological systems. Subsidence from earthquakes can lower water tables, as seen in the 2010–2011 Canterbury earthquakes in New Zealand, where liquefaction and fault movement altered groundwater flows, drying springs and increasing salinity in agricultural lands. Conversely, land uplift—such as that caused by the 2011 Tōhoku earthquake, which raised parts of Japan’s coast by up to 1.2 meters—can expose intertidal zones to air, killing marine organisms and altering shoreline ecosystems.

Climate feedbacks may also emerge. The 2004 Sumatra earthquake triggered methane hydrate destabilization in the ocean floor, releasing greenhouse gases that contributed to localized ocean acidification. Over time, these changes can shift dominant species, favoring hardier or invasive organisms while displacing native flora and fauna.

Mechanism of Ecosystem Alteration by Earthquakes

A single earthquake can initiate a cascading sequence of ecological changes through the following steps:
1. Sediment displacement: Ground shaking liquefies soil or destabilizes slopes, releasing sediment into waterways.
2. River course alteration: Sediment deposition raises riverbeds, changing flow paths and creating new channels or oxbow lakes.
3. Habitat inundation or exposure: Flooding from river diversions or land subsidence submerges terrestrial habitats, while uplift exposes coastal ecosystems to desiccation.
4. Biodiversity loss: Species adapted to original conditions perish, while opportunistic or invasive species exploit the disturbed environment.
5. Nutrient cycling disruption: Sediment and pollutant redistribution alter soil chemistry, affecting plant growth and microbial activity.
6. Long-term landscape evolution: Over decades, the new topography stabilizes, but species composition and ecosystem functions remain altered.

This process is exemplified by the 1964 Alaska earthquake (Mw 9.2), where siltation from landslides filled estuaries, reducing salmon spawning grounds and forcing migratory fish to adapt to new routes. Similarly, the 2010 Haiti earthquake triggered soil erosion that washed nutrients into the Caribbean Sea, creating dead zones where oxygen levels dropped to lethal levels for marine life.

Environmental Recovery Timelines: Natural vs. Human-Altered Landscapes

Recovery from earthquake-induced environmental damage varies significantly between natural and human-modified landscapes. Natural systems often rely on intrinsic resilience, while urban areas face additional challenges from infrastructure and pollution. The following table compares recovery factors:

Factor	Natural Landscape Recovery	Urban Recovery	Key Limiting Factor
Soil Rehabilitation	Decades to centuries; natural succession restores soil microbial communities and vegetation. Example: The 1980 Mount St. Helens eruption (triggered by seismic activity) saw forest regrowth within 20–30 years in undisturbed areas.	Years to decades; contaminated soil requires remediation (e.g., heavy metals from industrial zones). Example: The 2011 Tōhoku earthquake left petroleum-contaminated soil in Sendai, with cleanup ongoing after 10+ years.	Pollutant persistence in urban soils; lack of topsoil in natural systems.
Hydrological Restoration	Years to decades; rivers self-correct through sediment transport. Example: The 1999 İzmit earthquake in Turkey altered the Sakarya River course, but natural meandering resumed within 15 years.	Decades or unresolved; infrastructure (e.g., levees, pipes) disrupts natural flow. Example: The 2010 Haiti earthquake damaged aqueducts, leaving some areas with no potable water after 5 years.	Human-engineered barriers; sediment overload in natural systems.
Biodiversity Recovery	Centuries for climax communities; keystone species drive recovery. Example: The 1964 Alaska earthquake reduced bald eagle populations, but nesting sites rebounded within 50 years.	Ongoing or incomplete; invasive species dominate disturbed habitats. Example: The 2015 Nepal earthquake created open habitats where rhesus macaques expanded ranges, outcompeting native species.	Loss of keystone species; urban heat islands and light pollution.
Geomorphic Stability	Millennia for major landform changes; erosion and deposition reach equilibrium. Example: The 1857 Fort Tejon earthquake in California created sag ponds that persist as wetlands today.	Unstable indefinitely; human structures accelerate erosion. Example: The 2016 Kaikōura earthquake caused coastal cliff collapses, with ongoing landslide risks in developed areas.	Anthropogenic reinforcement of slopes; natural erosion cycles.

Natural landscapes exhibit exponential recovery in early stages, driven by primary succession, but long-term stabilization depends on undisturbed ecological processes. In contrast, urban recovery is linear or stagnant, constrained by economic resources, political will

Economic and Societal Disruptions from Earthquakes

Earthquakes trigger cascading economic and societal disruptions that extend far beyond immediate physical destruction. The financial burden includes direct costs such as reconstruction, emergency response, and infrastructure repairs, alongside indirect losses from disrupted supply chains, reduced productivity, and long-term economic stagnation. Societal impacts manifest through mass displacement, psychological trauma, and altered migration patterns, often exacerbating existing vulnerabilities. Quantifying these effects requires interdisciplinary metrics—from GDP contraction rates to disability-adjusted life years (DALYs)—to illustrate the compounded human and economic toll. This section examines the economic ripple effects, societal fractures, and systemic responses, using case studies from the 2015 Nepal earthquake and the 2023 Turkey-Syria disaster to contextualize global patterns.

Economic Ripple Effects and GDP Contraction

Earthquakes impose a dual economic burden: direct financial losses from physical damage and indirect economic drag from prolonged recovery phases. Direct costs typically account for 50–70% of total economic impact, with reconstruction alone consuming 10–20% of a country’s annual GDP. For example, the 2010 Haiti earthquake incurred reconstruction costs equivalent to $11.5 billion (8.5% of Haiti’s 2010 GDP), while the 2011 Tōhoku earthquake in Japan reached $300 billion (6% of Japan’s GDP), including nuclear disaster mitigation. Indirect losses emerge from business interruptions, tourism collapses, and supply chain disruptions, often persisting for years. The 2015 Nepal earthquake reduced tourism revenue by 40% in the first year post-quake, while agricultural output in affected districts dropped by 25% due to damaged irrigation systems.

GDP contraction varies by economic structure but frequently exceeds 1–3% annually in severely impacted regions. A 2017 World Bank study estimated that the 2015 Nepal earthquake cost the country $10.1 billion (35% of its GDP), with long-term growth forecasts revised downward by 0.5–1.5% per annum due to reduced foreign investment and labor productivity. Similarly, the 2023 Turkey-Syria earthquakes triggered a $101 billion economic loss (10% of Turkey’s GDP), with sectors like construction and manufacturing experiencing 12–18% output declines in the first six months post-disaster.

Key Economic Multipliers:

Direct Costs: Infrastructure repair (60%), emergency response (20%), lost wages (10%).

Indirect Costs: Business closures (30% of SMEs in affected zones), tourism decline (40–60% in high-risk areas), supply chain delays (2–5 months for critical imports).

Societal Disruptions: Displacement, Trauma, and Migration

Earthquakes disrupt social fabrics through forced displacement, psychological trauma, and permanent migration, often deepening pre-existing inequalities. The 2015 Nepal earthquake displaced 2.8 million people, with 300,000+ remaining in temporary shelters five years later. In Turkey and Syria, the 2023 earthquakes left 1.5 million homeless, while child displacement rates exceeded 40% in Gaziantep province. Long-term migration patterns reveal brain drain effects, as skilled workers relocate to safer regions. Post-2010 Haiti quake, 15% of the professional class emigrated, exacerbating labor shortages in healthcare and engineering.

Psychological trauma is a persistent consequence, with PTSD prevalence rates of 30–50% among survivors in acute phases. A 2016 study in Nepal found that 42% of earthquake-affected children exhibited symptoms of depression or anxiety, while adult trauma rates reached 45% in high-impact zones. The 2023 Turkey-Syria quakes saw 60% of survivors reporting sleep disorders and panic attacks within six months, with women and children disproportionately affected due to gendered vulnerability in disaster response.

Migration and Displacement Metrics:

Nepal (2015): 2.8M displaced; 12% of affected households permanently relocated to urban centers.

Turkey/Syria (2023): 1.5M homeless; 25% of displaced Syrians in Turkey abandoned informal settlements for cities.

Haiti (2010): 300,000+ internally displaced; 8% of Port-au-Prince’s population migrated to the Dominican Republic.

Quantifying Human Cost: DALYs and Years of Life Lost (YLL)

The human cost of earthquakes extends beyond mortality to years of life lost (YLL) and disability-adjusted life years (DALYs), which account for premature deaths and long-term disabilities. A DALY combines years lost due to premature mortality with years lived with disability, providing a standardized measure of health burden. For instance, the 2015 Nepal earthquake resulted in ~15,000 deaths but generated ~300,000 DALYs when factoring in injuries, chronic pain, and mental health disorders. Using the Global Burden of Disease (GBD) methodology, the YLL per 100,000 population in Nepal’s worst-affected districts exceeded 1,200, compared to the global average of ~500 for natural disasters.

DALY Calculation Framework (Simplified):
Total DALYs = Σ (Years of Life Lost) + Σ (Years Lived with Disability)

YLL = Number of deaths × Standard life expectancy at age of death.

YLD = Prevalence of disability × Duration × Disability weight (0–1 scale).

Example Calculation for Turkey-Syria (2023):

Deaths: 59,000 → YLL ≈ 59,000 × 65 years = 3.845 million YLL (assuming average age 65).

Injuries: 126,000 → YLD ≈ 126,000 × 1 year × 0.3 (moderate disability weight) = 37,800 YLD.

Total DALYs ≈ 3.88 million, equivalent to ~100 DALYs per 1,000 population in affected regions.

Systemic Responses: Government and NGO Interventions

Governments and NGOs deploy short-term stabilization measures and long-term recovery frameworks to mitigate economic and societal disruptions. A structured 4-column table below outlines disruption types, impacts, and response mechanisms, derived from post-disaster evaluations in Nepal, Turkey, and Haiti.

Disruption Type	Short-Term Impact	Long-Term Impact	Government/NGO Response
Supply Chain Breakdowns	Port closures (e.g., Haiti’s Port-au-Prince: 3-month delay), fuel shortages, food price spikes (+50% in Nepal’s Sindhupalchok).	Permanent relocation of industries (e.g., 20% of Turkish textile firms moved from Gaziantep to Istanbul), reduced export competitiveness.	UN World Food Programme (WFP) airlifted 500,000 metric tons of food to Nepal (2015). Turkey’s Emergency Logistics Center rerouted 80% of critical supplies via rail/road within 48 hours. World Bank’s Supply Chain Resilience Program funded $200M for Haiti’s port reconstruction.
Psychological Trauma and Mental Health Crisis	PTSD prevalence: 45% (Nepal), 60% (Turkey/Syria); suicide rates increased by 30% in earthquake zones.	Intergenerational trauma (e.g., Nepalese children born post-quake exhibit 20% higher anxiety rates); reduced workforce productivity.	Nepal’s Earthquakes serve as a stark reminder of nature’s unpredictable power, yet their consequences are not merely random—they are the product of well-documented geological and human-engineered systems. From the fracturing of tectonic plates to the collapse of poorly constructed buildings, each effect traces back to underlying mechanisms that can be studied, modeled, and mitigated. The economic and societal toll of seismic events underscores the necessity of proactive measures, from stricter building codes to advanced early warning systems, while the environmental aftermath highlights the delicate balance between human development and natural resilience. As urbanization expands into seismic zones and climate change potentially alters fault activity, the lessons from past disasters remain indispensable for safeguarding future generations against the irreversible impacts of earthquakes. FAQ What types of damage do earthquakes typically cause? Earthquakes can cause structural damage like collapsed buildings, cracked roads, and broken gas/water lines. They may also trigger landslides, fires (from ruptured utilities), and soil liquefaction in unstable areas. Indirect damage includes economic losses, injuries, and long-term displacement of populations. What types of seismic waves are generated by earthquakes? Earthquakes produce three main types of seismic waves: P-waves (primary, fastest, compressional), S-waves (secondary, slower, shear motion), and surface waves (Rayleigh and Love waves, causing most ground shaking). P-waves travel through solids, liquids, and gases, while S-waves only move through solids. What natural hazards are associated with earthquakes? Earthquakes can trigger landslides, tsunamis (from underwater quakes), flooding (due to dam failures or coastal subsidence), and volcanic activity (in tectonically active regions). Secondary hazards include aftershocks, ground liquefaction, and fires from ruptured infrastructure. Which tsunamis have been caused by major earthquakes? Notable tsunami-causing earthquakes include the 2004 Indian Ocean earthquake (magnitude 9.1–9.3, ~230,000 deaths), the 2011 Tōhoku earthquake (magnitude 9.0, Japan), and the 1960 Valdivia earthquake (magnitude 9.5, Chile). The 1883 Krakatoa eruption (also volcanic) and the 1755 Lisbon earthquake (magnitude ~8.5–9.0) also generated devastating tsunamis. What caused the recent earthquakes in Venezuela? Venezuela’s earthquakes are primarily caused by tectonic activity along the Caribbean Plate boundary, where it interacts with the South American Plate. The Boconó Fault and El Pilar Fault are major sources of seismic activity, often producing shallow, destructive quakes. Human-induced factors (e.g., reservoir-induced seismicity) are rare but possible in some cases. What are the causes and effects of earthquakes? Causes: Earthquakes occur due to tectonic plate movements (most common), volcanic activity, or human actions like fracking/reservoir filling. Effects include ground shaking, structural collapse, tsunamis, landslides, and long-term socioeconomic disruptions. They can also alter landscapes and trigger secondary hazards like disease outbreaks from contaminated water. disaster mitigation environmental impacts geological hazards infrastructure resilience seismic damage Leave a Comment Name Comment Post Comment Comments are moderated before appearing. The data you submit is processed according to the Privacy Policy of Voltefac.