The Nazca–South America Euler vector and its rate of change

Kendrick, Eric; Bevis, Michael; Smalley, Robert; Brooks, Benjamin A.; Vargas, Rodrigo Barriga; Laurı́a, Eduardo; Fortes, Luiz Paulo Souto

doi:10.1016/s0895-9811(03)00028-2

Cited by 263 publications

(244 citation statements)

References 13 publications

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“…The present-day subduction rate in the Maule region of Chile is about 62.5-66.0 mm yr −1 with a bearing of N78 • -80 • E (Angermann et al 1999;Kendrick et al 2003), which implies an obliqueness of ∼20 • . The M w 8.8 Maule earthquake on 2010 February 27 ruptured the megathrust segment north of the great 1960 Chile earthquake (Plafker & Savage 1970) and filled a well known seismic gap (Kelleher 1972) which last broke in 1835 (Caldcleugh 1836).…”

Section: T H E 0 1 0 F E B Rua Ry 7 M W 8 8 M Au L E E a Rt H Q Uamentioning

confidence: 99%

Comparison of postseismic afterslip models with aftershock seismicity for three subduction-zone earthquakes: Nias 2005, Maule 2010 and Tohoku 2011

Lange¹,

Bedford²,

Moreno³

et al. 2014

Geophysical Journal International

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Section: T H E 0 1 0 F E B Rua Ry 7 M W 8 8 M Au L E E a Rt H Q Uamentioning

confidence: 99%

Comparison of postseismic afterslip models with aftershock seismicity for three subduction-zone earthquakes: Nias 2005, Maule 2010 and Tohoku 2011

Lange¹,

Bedford²,

Moreno³

et al. 2014

Geophysical Journal International

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“…The results of ISC indicate the existence of two strongly coupled regions: offshore Lima and offshore Pisco city. Figure 1 shows the distribution of slip deficit rate, obtained by multiplying the ISC distribution by the plate convergence rate proposed by Kendrick et al (2003). Assuming this interseismic process stands since the last great 1746 event, up to 2010, we obtained a cumulative slip deficit equivalent to an earthquake with an M w 8.9 (Fig.…”

Section: Isc Model and Scenario Earthquakementioning

confidence: 99%

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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“…The Chile margin is formed by oblique convergence between the oceanic Nazca Plate and the South American continent at ∼ 66 mm/a (Angermann et al, 1999;Kendrick et al, 2003). Adjacent to the study area, the subducting Nazca Plate is ∼32 Ma old and the Perú-Chile trench is filled by 1.5-2.0 km of sediments (e.g.…”

Section: Regional Tectonic and Geologic Settingmentioning

confidence: 99%

Forearc uplift rates deduced from sediment cores of two coastal lakes in south-central Chile

et al. 2010

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The present paper introduces a new approach for deriving information about local forearc tectonics and related uplift rates based on the study of lake sediments. We investigated two coastal lakes at the south-central Chile margin, lakes Lanalhue and Lleu Lleu, located south of the Arauco Peninsula (38°S). Both lakes developed within the valleys of ancient rivers that once drained to the Pacific Ocean, being subsequently dammed by rising sills in the late Pleistocene/early Holocene. Seismic profiling and sedimentological analyses of cores from both lakes revealed similar successions consisting of marine to brackish sediments covered by lacustrine deposits. Radiocarbon dating indicates that the marine-lacustrine transition occurred at 8 ka and 8.15 ka, respectively. The correlation of this transition with global sea-level curves allowed the calculation of local uplift rates for the Holocene. Uplift rates for the lake basins amount to 0.42 ± 0.71 and 0.49 ± 0.44 mm/a, respectively, which are consistent with rates determined from a late Pleistocene marine terrace in the area. However, conspicuously higher, though likely transient, vertical movements at 8.83 ± 2.7 mm/a and 11.36 ±1.77 mm/a, respectively, were calculated for the sills that block both lakes nowadays. These barriers are interpreted to be the surface expression of a blind reverse fault associated to the Morguilla fault system, a seismically-active structure that controls uplift and folding along the adjacent Arauco Peninsula.

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The Nazca–South America Euler vector and its rate of change

Cited by 263 publications

References 13 publications

Comparison of postseismic afterslip models with aftershock seismicity for three subduction-zone earthquakes: Nias 2005, Maule 2010 and Tohoku 2011

Comparison of postseismic afterslip models with aftershock seismicity for three subduction-zone earthquakes: Nias 2005, Maule 2010 and Tohoku 2011

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

Forearc uplift rates deduced from sediment cores of two coastal lakes in south-central Chile

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