Limited overlap between the seismic gap and coseismic slip of the great 2010 Chile earthquake

2011 ◽  
Vol 4 (3) ◽  
pp. 173-177 ◽  
Author(s):  
S. Lorito ◽  
F. Romano ◽  
S. Atzori ◽  
X. Tong ◽  
A. Avallone ◽  
...  
Keyword(s):  
Seismic Gap ◽  
Coseismic Slip ◽  
Chile Earthquake

Complex Slip Distribution of the 2021 Mw 7.4 Maduo, China, Earthquake: An Event Occurring on the Slowly Slipping Fault

2021 ◽  
Author(s):  
Rumeng Guo ◽  
Hongfeng Yang ◽  
Yu Li ◽  
Yong Zheng ◽  
Lupeng Zhang
Keyword(s):  
Slip Rate ◽  
Slip Distribution ◽  
Seismic Gap ◽  
Seismogenic Fault ◽  
Coseismic Slip ◽  
Slip Rates ◽  
Kunlun Mountain ◽  
Coulomb Failure ◽  
Main Fault ◽  
Large Earthquakes

Abstract The 21 May 2021 Maduo earthquake occurred on the Kunlun Mountain Pass–Jiangcuo fault (KMPJF), a seismogenic fault with no documented large earthquakes. To probe its kinematics, we first estimate the slip rates of the KMPJF and Tuosuo Lake segment (TLS, ∼75 km north of the KMPJF) of the East Kunlun fault (EKLF) based on the secular Global Positioning System (GPS) data using the Markov chain Monte Carlo method. Our model reveals that the slip rates of the KMPJF and TLS are 1.7 ± 0.8 and 7.1 ± 0.3 mm/yr, respectively. Then, we invert high-resolution GPS and Interferometric Synthetic Aperture Radar observations to decipher the fault geometry and detailed coseismic slip distribution associated with the Maduo earthquake. The geometry of the KMPFJ significantly varies along strike, composed of five fault subsegments. The most slip is accommodated by two steeply dipping fault segments, with the patch of large sinistral slip concentrated in the shallow depth on a simple straight structure. The released seismic moment is ∼1.5×1020  N·m, equivalent to an Mw 7.39 event, with a peak slip of ∼9.3 m. Combining the average coseismic slip and slip rate of the main fault, an earthquake recurrence period of ∼1250−400+1120  yr is estimated. The Maduo earthquake reminds us to reevaluate the potential of seismic gaps where slip rates are low. Based on our calculated Coulomb failure stress, the Maduo earthquake imposes positive stress on the Maqin–Maqu segment of the EKLF, a long-recognized seismic gap, implying that it may accelerate the occurrence of the next major event in this region.

scholarly journals Coseismic slip and afterslip of the 2015 Mw 8.3 Illapel (Chile) earthquake determined from continuous GPS data

2016 ◽  
Vol 43 (20) ◽  
pp. 10,710-10,719 ◽  
Author(s):  
Mahesh N. Shrivastava ◽  
Gabriel González ◽  
Marcos Moreno ◽  
Mohamed Chlieh ◽  
Pablo Salazar ◽  
...  
Keyword(s):  
Gps Data ◽  
Coseismic Slip ◽  
Chile Earthquake ◽  
Continuous Gps

Impact of ionosphere on InSAR observation and coseismic slip inversion: Improved slip model for the 2010 Maule, Chile, earthquake

2021 ◽  
Vol 267 ◽  
pp. 112733
Author(s):  
Bochen Zhang ◽  
Xiaoli Ding ◽  
Falk Amelung ◽  
Chisheng Wang ◽  
Wenbin Xu ◽  
...  
Keyword(s):  
Slip Model ◽  
Coseismic Slip ◽  
Chile Earthquake

scholarly journals Coseismic slip and early afterslip of the 2015 Illapel, Chile, earthquake: Implications for frictional heterogeneity and coastal uplift

2016 ◽  
Vol 121 (8) ◽  
pp. 6172-6191 ◽  
Author(s):  
William D. Barnhart ◽  
Jessica R. Murray ◽  
Richard W. Briggs ◽  
Francisco Gomez ◽  
Charles P. J. Miles ◽  
...  
Keyword(s):  
Coseismic Slip ◽  
Chile Earthquake ◽  
Coastal Uplift

scholarly journals Correction to “Coseismic slip distribution of the February 27, 2010 Mw 8.8 Maule, Chile earthquake”

2011 ◽  
Vol 38 (14) ◽  
pp. n/a-n/a
Author(s):  
Fred F. Pollitz ◽  
Ben Brooks ◽  
Xiaopeng Tong ◽  
Michael G. Bevis ◽  
James H. Foster ◽  
...  
Keyword(s):  
Slip Distribution ◽  
Coseismic Slip ◽  
Chile Earthquake

Geotechnical Aspects of the 2015 Mw 8.3 Illapel Megathrust Earthquake Sequence in Chile

2017 ◽  
Vol 33 (2) ◽  
pp. 709-728 ◽  
Author(s):  
Gabriel Candia ◽  
Gregory P. de Pascale ◽  
Gonzalo Montalva ◽  
Christian Ledezma
Keyword(s):  
Earthquake Sequence ◽  
Lateral Spread ◽  
Seismic Gap ◽  
Coastal Zones ◽  
Bridge Abutments ◽  
Coseismic Slip ◽  
Tsunami Waves ◽  
Wave Measurements ◽  
Near Shore ◽  
2015 Illapel Earthquake

The 2015 Illapel earthquake sequence in Central Chile, occurred along the subduction zone interface in a known seismic gap, with moment magnitudes of M w 8.3, M w 7.1, and M w 7.6. The main event triggered tsunami waves that damaged structures along the coast, while the surface ground motion induced localized liquefaction, settlement of bridge abutments, rockfall, debris flow, and collapse in several adobe structures. Because of the strict seismic codes in Chile, damage to modern engineered infrastructure was limited, although there was widespread tsunami-induced damage to one-story and two-stories residential homes adjacent to the shoreline. Soon after the earthquake, shear wave measurements were performed at selected potentially liquefiable sites to test recent V S-based liquefaction susceptibility approaches. This paper describes the effects that this earthquake sequence and tsunami had on a number of retaining structures, bridge abutments, and cuts along Chile's main highway (Route 5). Since tsunami waves redistribute coastal and near shore sand along the coast, liquefaction evidence in coastal zones with tsunami waves is sometimes obscured within minutes because the tsunami waves entrain and deposit sand that covers or erodes evidence of liquefaction (e.g., lateral spread or sand blows). This suggests that liquefaction occurrence and hazard may be under estimated in coastal zones. Importantly, the areas that experienced the greatest coseismic slip, appeared to have the largest volumes of rockfall that impacted roads, which suggests that coseismic slip maps, generated immediately after the shaking stops, can provide a first order indication about where to expect damage during future major events.

Coseismic slip of the 2010 Mw 8.8 Great Maule, Chile, earthquake quantified by the inversion of GRACE observations

2012 ◽  
Vol 335-336 ◽  
pp. 167-179 ◽  
Author(s):  
Lei Wang ◽  
C.K. Shum ◽  
Frederik J. Simons ◽  
Andrés Tassara ◽  
Kamil Erkan ◽  
...  
Keyword(s):  
Coseismic Slip ◽  
Chile Earthquake

scholarly journals Coseismic slip distribution of the February 27, 2010 Mw 8.8 Maule, Chile earthquake

2011 ◽  
Vol 38 (9) ◽  
pp. n/a-n/a ◽  
Author(s):  
Fred F. Pollitz ◽  
Ben Brooks ◽  
Xiaopeng Tong ◽  
Michael G. Bevis ◽  
James H. Foster ◽  
...  
Keyword(s):  
Slip Distribution ◽  
Coseismic Slip ◽  
Chile Earthquake

scholarly journals Subduction earthquakes controlled by incoming plate geometry: The 2020 M>7.5 Shumagin, Alaska, earthquake doublet

2021 ◽  
Author(s):  
Yu Jiang ◽  
Pablo González ◽  
Roland Bürgmann
Keyword(s):  
Subduction Zones ◽  
Stress Transfer ◽  
Global Navigation Satellite Systems ◽  
Inversion Method ◽  
Seismic Gap ◽  
Shear Stresses ◽  
Spreading Ridge ◽  
Depth Range ◽  
Coseismic Slip ◽  
Earthquake Doublet

In 2020, an earthquake doublet, a M7.8 on July 22nd and a M7.6 on October 19th, struck the Alaska-Aleutian subduction zone beneath the Shumagin Islands. This is the first documented earthquake doublet, of considerable size, involving a megathrust event and a strike-slip event, with both events producing deeply buried ruptures. The first event partially ruptured a seismic gap, which has not hosted large earthquakes since 1917, and the second event was unusual as it broke a trench-perpendicular fault within the incoming oceanic slab. We used an improved Bayesian geodetic inversion method to estimate the fault slip distributions of the major earthquakes using Interferometric Synthetic Aperture Radar (InSAR) wrapped phase and Global Navigation Satellite Systems (GNSS) offsets data. The geodetic inversions reveal that the Shumagin seismic gap is multi-segmented, and the M7.8 earthquake ruptured the eastern segment from 14 km down to 44 km depth. The coseismic slip occurred along a more steeply, 26-degree dipping segment, and was bounded up-dip by a bend of the megathrust interface to a shallower 8-degree dip angle connecting to the trench. The model for the M7.6 event tightly constrained the rupture depth extent to 23-37 km, within the depth range of the M7.8 coseismic rupture area. We find that the M7.6 event ruptured the incoming slab across its full seismogenic thickness, potentially reactivating subducted Kula-Resurrection seafloor-spreading ridge structures. Coulomb stress transfer models suggest that coseismic and/or postseismic slip of the M7.8 event could have triggered the M7.6 event. This unusual intraslab event could have been caused by accumulation and localization of flexural elastic shear stresses at the slab bending region. We conclude that the segmented megathrust structure and the location of intraslab fault structures limited the rupture dimensions of the M7.8 event and are responsible for the segmentation of the Shumagin seismic gap. Our study suggests that the western and shallower up-dip segments of the seismic gap did not fail and remain potential seismic and tsunami hazard sources. The unusual earthquake doublet provides a unique opportunity to improve our understanding of the role of the subducting lithosphere structure in the segmentation of subduction zones.

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