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

Pulido, Nelson; Yagi, Y.; Kumagai, Hiroyuki; Nishimura, Naoki

doi:10.5047/eps.2011.04.008

Cited by 16 publications

(21 citation statements)

References 15 publications

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“…Some studies of the 2010 Maule earthquake support this hypothesis (Moreno et al, 2010;Pulido et al, 2011), even though the debate is still active as other studies indicate a limited overlap between seismic gap and coseismic slip (Lorito et al, 2011). A comparison of several source models for the Maule earthquake show, however, that there is a large uncertainty on the location of regions of large slip (i.e., Delouis et al, Figure 10.…”

Section: Discussionmentioning

confidence: 99%

“…(a) Average V S for the shallowest 10 m of soil (AV S10 ) in Lima . (b) Amplifications with respect to the engineering bedrock in Lima, defined as the average amplifications (0:05 ∼ 1 s) of the transfer functions at each grid point (V S ∼ 400 m=s) 2010; Lorito et al, 2011;Pulido et al, 2011;and Lay et al, 2010), so a definite conclusion based on this earthquake alone is difficult due to the uncertainties involved. On the other hand there are many other examples of coincidence between coseismic slip and interseismic coupling for worldwide subduction zones such as in Sumatra Konca et al, 2008), in Japan (Hashimoto et al, 2009;Loveless and Meade, 2011), and in Chile (Moreno et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

“…The k c value was selected to approximately correspond to the size of the long-wavelength asperity size (125 km; Fig. 3d), which is about five times the corner wavenumber of the GSM. In Figure 4a, we compare the PSD of a slip model of the 2010 Maule earthquake, Chile (green line) (Pulido et al, 2011), with the PSD of our geodetic scenario slip for central Peru coast (red line). The similarity of these PSD's suggests that our methodology might be appropriate to characterize megathrust earthquakes in this region.…”

Section: Slip Scenario Earthquakementioning

confidence: 99%

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Scenario Source Models and Strong Ground Motion for Future Mega‐earthquakes: Application to Lima, Central Peru

Pulido¹,

Aguilar²,

Tavera³

et al. 2015

Bulletin of the Seismological Society of America

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The 2011 moment magnitude (M w ) 9.0 Tohoku-Oki Japan earthquake occurred in a region where giant megathrust earthquakes were not expected. This earthquake proved the difficulty in assessing seismic hazard by relying mainly on information from historical and instrumental seismicity. To help improve the seismic-hazard assessment for such rare events, we propose a methodology to estimate the slip distribution of future megathrust earthquakes based on a model of interseismic coupling distribution in subduction margins, as well as information of historical earthquakes, and apply the method to the central Peru region, Lima. The slip model obtained from geodetic data represents the large scale features of asperities within the megathrust, which is appropriate for simulation of long-period waves and tsunami modeling. For the simulation of a broadband strong ground motion, we add small scale heterogeneities to the source slip to be able to simulate high frequencies. To achieve this purpose, we propose broadband source models constructed by adding short-wavelength slip distributions obtained from a Von Karman power spectral density function, to the slip model inferred from interseismic geodetic data. Using these slip models and assuming several hypocenter locations, we calculate a set of strong ground motions for Lima and incorporate site effects obtained from microtremors surveys and geotechnical data. Our simulated average pseudospectral accelerations (period 0.3 s) are above 1:5g for wide areas in Lima, which may be critical in terms of damage of low-to midrise masonry and reinforced concrete buildings, which characterize the majority of buildings in Lima.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Slip Scenario Earthquakementioning

confidence: 99%

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Scenario Source Models and Strong Ground Motion for Future Mega‐earthquakes: Application to Lima, Central Peru

Pulido¹,

Aguilar²,

Tavera³

et al. 2015

Bulletin of the Seismological Society of America

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“…Coastal land-level changes were also reported by the field survey (FARIAS et al, 2010). Various source models of this earthquake have been proposed by using seismic waves (LAY et al, 2010;PULIDO et al, 2011), global positioning system (GPS) data (TONG et al, 2010), GPS and interferometric synthetic aperture radar (InSAR) data (DELOUIS et al, 2010;VIGNY et al, 2011), or geodetic data and tsunami waveforms (LORITO et al, 2011). Among them, VIGNY et al (2011) compiled the slip distributions from the aforementioned studies and compared them with the observed GPS data.…”

Section: Introductionmentioning

confidence: 99%

Slip Distribution and Seismic Moment of the 2010 and 1960 Chilean Earthquakes Inferred from Tsunami Waveforms and Coastal Geodetic Data

Fujii

Satake

2012

Pure Appl. Geophys.

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Abstract-The slip distribution and seismic moment of the 2010 and 1960 Chilean earthquakes were estimated from tsunami and coastal geodetic data. These two earthquakes generated transoceanic tsunamis, and the waveforms were recorded around the Pacific Ocean. In addition, coseismic coastal uplift and subsidence were measured around the source areas. For the 27 February 2010 Maule earthquake, inversion of the tsunami waveforms recorded at nearby coastal tide gauge and Deep Ocean Assessment and Reporting of Tsunamis (DART) stations combined with coastal geodetic data suggest two asperities: a northern one beneath the coast of Constitucion and a southern one around the Arauco Peninsula. The total fault length is approximately 400 km with seismic moment of 1.7 9 10 22 Nm (Mw 8.8). The offshore DART tsunami waveforms require fault slips beneath the coasts, but the exact locations are better estimated by coastal geodetic data. The 22 May 1960 earthquake produced very large, *30 m, slip off Valdivia. Joint inversion of tsunami waveforms, at tide gauge stations in South America, with coastal geodetic and leveling data shows total fault length of *800 km and seismic moment of 7.2 9 10 22 Nm (Mw 9.2). The seismic moment estimated from tsunami or joint inversion is similar to previous estimates from geodetic data, but much smaller than the results from seismic data analysis.

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“…The dimensions of the fault plane were over 500 km length by 180 km width (LAY et al 2010;TONG et al 2010;POLLITZ et al 2011). Several authors studied the source of the earthquake using seismic waveforms (LAY et al 2010;PULIDO et al 2011), global positioning system measurements (MORENO et al 2010;TONG et al 2010), and tsunami data (WU and HO 2011;LORITO et al 2011;FUJII and SATAKE 2013). The field observations and tsunami records of these events indicate that the significant coastal impacts were locally concentrated.…”

Section: The Three Recent Chilean Tsunamismentioning

confidence: 99%

Tsunami Characteristics Along the Peru–Chile Trench: Analysis of the 2015 Mw8.3 Illapel, the 2014 Mw8.2 Iquique and the 2010 Mw8.8 Maule Tsunamis in the Near-field

Omira

Baptista

Lisboa

2016

Pure Appl. Geophys.

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Tsunamis occur quite frequently following large magnitude earthquakes along the Chilean coast. Most of these earthquakes occur along the Peru-Chile Trench, one of the most seismically active subduction zones of the world. This study aims to understand better the characteristics of the tsunamis triggered along the Peru-Chile Trench. We investigate the tsunamis induced by the Mw8.3 Illapel, the Mw8.2 Iquique and the Mw8.8 Maule Chilean earthquakes that happened on September 16th, 2015, April 1st, 2014 and February 27th, 2010, respectively. The study involves the relation between the co-seismic deformation and the tsunami generation, the near-field tsunami propagation, and the spectral analysis of the recorded tsunami signals in the near-field. We compare the tsunami characteristics to highlight the possible similarities between the three events and, therefore, attempt to distinguish the specific characteristics of the tsunamis occurring along the Peru-Chile Trench. We find that these three earthquakes present faults with important extensions beneath the continent which result in the generation of tsunamis with short wavelengths, relative to the fault widths involved, and with reduced initial potential energy. In addition, the presence of the Chilean continental margin, that includes the shelf of shallow bathymetry and the continental slope, constrains the tsunami propagation and the coastal impact. All these factors contribute to a concentrated local impact but can, on the other hand, reduce the far-field tsunami effects from earthquakes along Peru-Chile Trench.

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

Cited by 16 publications

References 15 publications

Scenario Source Models and Strong Ground Motion for Future Mega‐earthquakes: Application to Lima, Central Peru

Scenario Source Models and Strong Ground Motion for Future Mega‐earthquakes: Application to Lima, Central Peru

Slip Distribution and Seismic Moment of the 2010 and 1960 Chilean Earthquakes Inferred from Tsunami Waveforms and Coastal Geodetic Data

Tsunami Characteristics Along the Peru–Chile Trench: Analysis of the 2015 Mw8.3 Illapel, the 2014 Mw8.2 Iquique and the 2010 Mw8.8 Maule Tsunamis in the Near-field

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