A seismological study of the 1835 seismic gap in south-central Chile

Campos, Jaime; Hatzfeld, Denis; Madariaga, Raúl; López, Gloria I.; Kausel, Edgar E.; Zollo, Aldo; Iannacone, G; Fromm, Robert E.; Barrientos, Sergio; Lyon‐Caen, H.

doi:10.1016/s0031-9201(02)00051-1

Cited by 94 publications

(81 citation statements)

References 22 publications

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“…Before 2010, this region had been long recognized as a mature seismic gap (Barrientos, 1987;Campos et al, 2002), and surface velocities estimated from Global Positioning System (GPS) measurements suggested a high degree of coupling between the Nazca and South American plates (Ruegg et al, 2009;Moreno et al, 2011;Métois et al, 2012). Theoretically, the average slip available for such a megathrust earthquake -the slip deficit -equals the plate convergence rate multiplied by the time since the last earthquake (175 years in this case) and the degree of plate coupling.…”

Section: Resumen Laguna Sísmica De Darwin Cerrada Por El Terremoto Dmentioning

confidence: 99%

Darwin’ seismic gap closed by the 2010 Maule earthquake

Melnick

Moreno

Cisternas

et al. 2012

andgeo

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Section: Resumen Laguna Sísmica De Darwin Cerrada Por El Terremoto Dmentioning

confidence: 99%

Darwin’ seismic gap closed by the 2010 Maule earthquake

Melnick

Moreno

Cisternas

et al. 2012

andgeo

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“…The moment rate function of the earthquake is displayed in the inset. Approximate source areas of the 1960 and 1985 earthquakes are shown (Barrientos and Ward, 1990;Campos et al, 2002).…”

Section: Datamentioning

confidence: 99%

“…1). Interseismic strain accumulation measurements indicated that the Concepción-Constitución area was a mature seismic gap (Campos et al, 2002;Ruegg et al, 2009), which overlaps the rupture area of the great 1835 earthquake. In this study we investigate the rupture process of the Maule earthquake based on an inversion of teleseismic body waves recorded by the Global Seismic Network.…”

Section: Introductionmentioning

confidence: 99%

Rupture process and coseismic deformations of the 27 February 2010 Maule earthquake, Chile

et al. 2011

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We estimated the spatial and temporal slip distribution for the 27 February 2010 Maule earthquake from teleseismic body wave data. To obtain a stable inversion solution, we used the data covariance matrix from the observation and modeling errors, incorporated smoothing constraints and determined their optimal values by using the Akaike Bayesian Information Criterion (ABIC). The fault rupture can be divided into three stages. For the first 30 s the rupture started as an elliptical crack elongated in the in-plane direction along the dip. After 30 s the rupture propagated bi-laterally along strike reaching the maximum moment release rate at around 50 s near the hypocenter. Finally the rupture propagated mainly to the north reaching another peak of moment release rate at 80 s and 130 km north-east from the hypocenter. Main rupture lasted for about 110 s. In order to evaluate our source model, we calculated the predicted coseismic vertical displacements and compare them with observed uplift/subsidence values measured along the coastline, as well as displacements obtained from strong ground motion and high-sampling GPS records in Concepción. Our model provides good estimations of the static displacements in the northern source region, but under-estimates the coseismic uplifts in the southern region.

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“…• S), as inferred from both seismic and GPS data (McCann et al 1979;Campos et al 2002;Ruegg et al 2002;Moreno et al 2008;Ruegg et al 2009). This region has not experienced significant earthquakes (M > 8) for nearly 200 yr. Several studies examined the interseismic coupling in this region by inverting displacement rates measured before the Maule earthquake (Moreno et al 2008;Ruegg et al 2009; Metois et al 2012).…”

Section: Introductionmentioning

confidence: 99%

To which level did the 2010 M 8.8 Maule earthquake fill the pre-existing seismic gap?

Wang

Hainzl

Martin

2017

Geophysical Journal International

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S U M M A R YThere is a long-standing debate whether or not the 2010 M 8.8 Maule earthquake filled a pre-existing seismic gap in which no large earthquake occurred for about 200 yr. Utilizing the inversion approach of Wang et al. that considers elastic strain accumulation and strain release during the earthquake cycle and includes the fault-coupling state as prior information in coseismic slip modelling, we investigate the inter-and coseismic slip balance for the 2010 M 8.8 Maule earthquake. The coseismic slip model is obtained as the product of three components: the interseismic backslip rate, the strain accumulation time, and the fraction of coseismically released slip potency (the product of slip and slip area) that may either fully or partially release the local strain. We construct slip models using the Slab1.0 fault geometry, and constrain the strain accumulation time for the 2010 Maule earthquake based on historical large earthquakes in the region. The results demonstrate that two slip clusters (north and south of the hypocentre) are required to model the geodetically measured coseismic displacements. The slip patch south of the hypocentre is located in a strongly coupled zone, and possibly released the local strain completely. The slip area north of the hypocentre overlaps with the interseismically creeping zone in which strain buildup may be low. The northern slip patch released higher slip potency than accumulated since the last mega-event in 1751, suggesting a possible dynamic overshoot during coseismic rupture (under the assumption that the last major earthquake has reset the regional strain). Alternatively, the last big event may not have fully released the strain in this region. Our study reveals that the Maule earthquake, combing its coseismic and post-seismic slip over 1.3 yr, released ∼67-72 per cent of the local strain. Remaining strain is concentrated mainly south of the hypocentre, with potency equivalent to an M 8.4 event considering strain accumulation for 259 yr (since 1751).

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A seismological study of the 1835 seismic gap in south-central Chile

Cited by 94 publications

References 22 publications

Darwin’ seismic gap closed by the 2010 Maule earthquake

Darwin’ seismic gap closed by the 2010 Maule earthquake

Rupture process and coseismic deformations of the 27 February 2010 Maule earthquake, Chile

To which level did the 2010 M 8.8 Maule earthquake fill the pre-existing seismic gap?

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