Los deslizamientos causados por el Terremoto de Limón: factores de control y comparación con otros eventos en Costa Rica

Mora, Sergio Basilio Sepúlveda; Mora, Raúl Alberto

doi:10.15517/rgac.v0i0.13447

Cited by 7 publications

(8 citation statements)

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“…Keefer & Wilson, 1989) e inclusive a nivel centroamericano (Bommer & Rodríguez, 2002;Rodríguez, 2007;devoli et al, 2009) y costarricense (Mora & Morales, 1986, 1992Mora & Mora, 1994), en donde se establecen las relaciones entre la magnitud de los sismos, el área afectada, el área deslizada, y la generación de corrientes de barro, entre otras cosas. En Costa Rica, los deslizamientos y corrientes de lodo importantes se han generado a partir de sismos con magnitudes > 5,2 (Mora & Mora, 1994). Según dicho trabajo, los deslizamientos disparados por sismos con IMM VII pueden ocasionar que en un área de 90 km 2 aparezcan al menos un deslizamiento por km 2 (área de la destrucción de alrededor del 60%).…”

Section: Discussionunclassified

“…Según dicho trabajo, los deslizamientos disparados por sismos con IMM VII pueden ocasionar que en un área de 90 km 2 aparezcan al menos un deslizamiento por km 2 (área de la destrucción de alrededor del 60%). Para una magnitud de 6,2 como la del terremoto de Cinchona, el área afectada > 60% según las relaciones de Mora & Mora (1994) sería . Esta área es coincidente con los datos preliminares aportados por la RSN, para un total de al menos 349 deslizamientos de diversos tañamos, contabilizando un área total de 21,7 km 2 de material completamente deslizado (Fig.…”

Section: Discussionunclassified

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Aspectos geohidrológicos y sedimentológicos de los flujos de lodo asociados al terremoto de Cinchona (Mw 6,2) del 8 de enero del 2009, Costa Rica

Alvarado

2009

Rev. Geol. Amér. Central

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Section: Discussionunclassified

Aspectos geohidrológicos y sedimentológicos de los flujos de lodo asociados al terremoto de Cinchona (Mw 6,2) del 8 de enero del 2009, Costa Rica

Alvarado

2009

Rev. Geol. Amér. Central

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“…Historically, the region has experienced large earthquakes with devastating secondary impacts, notably the 1991 Limon Ww 7.6 earthquake, which triggered landslides over an area of approximately 2000 km 2 in close proximity with Puerto Limon and other population centers (Mora and Mora, 1994). Geophysical observations suggest that subduction of the Cocos Ridge increases plate coupling, resulting in part of the Cocos plates relative motion being transferred and accommodated by back-arc crustal shortening (Suarez et al, 1995).…”

Section: Back-arc Convergencementioning

confidence: 99%

Application of Scenario Earthquakes for Analysis of Seismically Triggered Landslide Hazard: A Case Study in Costa Rica

Seal

Jessee

Hamburger

et al. 2022

Rev. Geol. Amér. Central

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In this study, we demonstrate the capabilities of hypothetical scenario earthquakes as a new tool for assessment of hazards associated with earthquake-triggered landslides. Costa Rica offers an ideal environment for demonstrating the utility of scenario earthquakes due to its diverse tectonic environments and associated widespread seismic hazard, rugged topography, and high landslide susceptibility. We investigate the relative influence of landslide proxies such as topographic slope, peak ground velocity (PGV), and compound topographic index (CTI), and earthquake source parameters such as magnitude and depth, on predicted landslide probability and fatality. We examine five distinct tectonic environments, including subduction events beneath the (1) Nicoya and (2) Osa peninsulas respectively, (3) intraplate earthquakes beneath the Central Volcanic Range (CVR) and (4) the Central Costa Rica Deformed Belt (CCRDB), and (5) back-arc thrust events on the eastern Caribbean coast. Our results demonstrate that the slope, PGV, and CTI thresholds necessary to produce landslide probabilities greater than 10% vary by tectonic environment. In all cases, we observe magnitude to be the primary control on the predicted maximum landslide probability and overall areal landslide coverage. We validate model predictions with observed landslide inventories from the 2009 Cinchona and 1991 Limon earthquakes, demonstrating a good fit, where over 70% of landslides occurring in zones of greater than 20% probability. We also use a global model of landslide impact to predict exposure and fatality ranges for each scenario earthquake of this study, revealing that moderate-sized earthquakes in the CCRDB and CVR and large subduction megathrust earthquakes each pose a significant hazard to Costa Rica’s population.

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“…In Costa Rica, significant landslides and mudflows have been generated from earthquakes with magnitudes > 5.2 (Mora and Mora, 1994). In the Miravalles volcano and neighboring areas there are a large number of active and potentially active faults (Montero and Alvarado 1988;Denyer et al 2003;, so the probability of a major earthquake (M >5.5) that could trigger landslides on volcanoes must be considered.…”

Section: Earthquakesmentioning

confidence: 99%

The importance of overbank deposits and paleosol analyses for comprehensive volcanic hazard evaluation: The case of Holocene volcanism at Miravalles Volcano, Costa Rica

Ryan¹,

Alvarado²,

McCanta³

et al. 2021

Preprint

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On the flanks of the dormant Miravalles volcano, systematic fieldwork and radiocarbon dating of buried humus-rich soils (paleosols) and wood fragments, augmented by mineralogical and geochemical analysis, reveal extensive and previously undocumented Holocene activity. Phase 1 consisted of 8.3 ka (~6300 BCE) volcanic debris avalanche and thick lapilli blast and fallout deposit that appear coeval. Hiatus 1 marks 2600 years of inactivity ensued followed by Phase 2 lapilli interbedded with ~5.5 ka lahars below a 5.3 ka basaltic lava flow (~3400 BCE). Hiatus 2 lasted 1800 years from 5.3 ka to 3.5 ka (3300-1500 BCE), after which a very active Phase 3 ensued (3.5 to 0.5 ka; 1600 BCE to 1500 CE) with > four lapilli eruptions, > 4 lahars, > 6 layers of ash and pumice, and small andesitic lava flows. The most recent evidence for eruption is an 880-year-old (0.9 ka; 1070 CE) lapilli overlain by gravels that may represent distal lahar sediments. Evidence indicates the occurrence of at least two, if not three, destructive lahars on the southwest flank of Miravalles in the past 500 years. The overbank sedimentary record indicates much more activity of Miravalles volcano over the past 3500 years (since 1500 BCE) than previously known, with a minimum of 24 events in that span. Overbank floodplain deposits are likely to contain the most compete record of recent activity in active and dormant volcanoes, and in the absence of dateable vegetation fragments, radiocarbon dating of paleosol A-horizons is very useful, with a precision of ~ 10%, i.e. 800 + 80 ybp.

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Los deslizamientos causados por el Terremoto de Limón: factores de control y comparación con otros eventos en Costa Rica

Cited by 7 publications

References 0 publications

Aspectos geohidrológicos y sedimentológicos de los flujos de lodo asociados al terremoto de Cinchona (Mw 6,2) del 8 de enero del 2009, Costa Rica

Aspectos geohidrológicos y sedimentológicos de los flujos de lodo asociados al terremoto de Cinchona (Mw 6,2) del 8 de enero del 2009, Costa Rica

Application of Scenario Earthquakes for Analysis of Seismically Triggered Landslide Hazard: A Case Study in Costa Rica

The importance of overbank deposits and paleosol analyses for comprehensive volcanic hazard evaluation: The case of Holocene volcanism at Miravalles Volcano, Costa Rica

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