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![Coseismic slip models of the 2015 Mw 8.3 Illapel earthquake. (a) Slip distribution based on the W‐phase solution 6 min after origin time. (b) Slip distribution based on the W‐phase solution 10 min after origin time. The color version of this figure is available only in the electronic edition.]()
![Slip distribution of the 2015 Illapel earthquake. (a) Coseismic slip distribution inverted from static GPS displacements (difference between 17 September and 16 September) showing the discretization used in this work. (b) Checkerboard test for the finite source slip inversion using squares of 60 km of side (left figure, input model; right figure, recovered model).The color version of this figure is available only in the electronic edition.]()
![Vertical uplift produced by the 2015 Illapel earthquake. (a) Vertical displacements on the surface predicted by our coseismic slip distribution. Black dots are geological observation of coastal uplift; the triangles are locations of GPS antennas. (b) White fringe of bleached lithothamnioids observed at Puerto Oscuro, in front of the epicenter. (c) Aerial view of white fringe of bleached algae observed along the coast to the north of the epicenter.The color version of this figure is available only in the electronic edition.]()
![Aftershocks of the 2015 Illapel earthquake. (a) Seismicity reported by CSN between 16 September 2015 and 30 September 2015. (b) Seismicity reported from CSN between 1 October 2015 and 10 December 2015. The open circles correspond to the seismicity shown in (a). Contours of the coseismic slip distribution of Figure 7 are plotted in the figures for reference.The color version of this figure is available only in the electronic edition.]()
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![Tectonic setting and main geological features of the 2015 Illapel earthquake. Blue triangles present the distribution of Global Positioning System (GPS) sites. Black contoured ellipses and red contoured ellipses refer to maximal rupture zones of historical megathrust earthquakes before 1950s and since 1950s separately (Comte and Pardo, 1991; Comte et al., 2002; Lomnitz, 2004). The red stars and red focal mechanism plots show the epicenters and focal mechanisms, for interplate earthquakes that occurred in the past 50 yr. The green star and green focal mechanism plot denote the epicenter and focal mechanism of the 2015 Mw 8.3 Illapel earthquake. Light blue arrows indicate the subduction rate of the Nazca plate to South American plate. The gray line outlines the study area in this article. CFZ, Challenger Fracture Zone; CoR, Copiapo ridge; JFR, Juan Fernandez ridge; SGR, Salary Gomez ridge. Inset shows the large‐scale tectonic environment.]()
![Moment tensors of aftershocks of the 2015 Illapel earthquakes. (a) Moment tensor determination for events of magnitude greater than Mw 5.0 occurred between 16 September 2015 and 5 October 2015. The gray focal mechanisms are those interpreted as intraplate intermediate depth or crustal events. (b) Schematic profile of the Nazca plate subduction in the Illapel region based on Hayes et al. (2012) and Contreras‐Reyes et al. (2015). The hatched zone is composed of eroded and fractured volcanics (Contreras‐Reyes et al., 2015) that could act as an up‐dip limit for the seismic rupture.The color version of this figure is available only in the electronic edition.]()
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![Regional 3D view of the continental margin along the Coquimbo–Illapel region, showing the distribution of the vertical slip produced by the 2015 Illapel megathrust earthquake and seismic reflection data (modified from Contreras‐Reyes et al., 2015; Melgar et al., 2016), together with the run‐ups observed along the coast (this work). The color version of this figure is available only in the electronic edition.]()
![(a) Rupture lengths of large interplate earthquakes (M >7.6–7.7) since the eighteenth century (modified from Dorbath et al., 1990; Comte and Pardo, 1991; Ruiz and Madariaga, 2018). (b) Regional tectonic setting of the Chilean subduction margin showing major tsunamigenic megathrust earthquakes since the late nineteenth century; the red rectangle shows the rupture area of the 2015 Illapel earthquake. (c) Coseismic slip distribution of the 2015 Illapel megathrust earthquake (from Melgar et al., 2016) and aftershocks during the first two weeks following this episode (from National Seismological Centre). The color version of this figure is available only in the electronic edition.]()
![A: Seismicity in the Illapel area (Chile). The color map represents the logarithmic summation of the seismicity in a 0.1° grid from A.D. 1990 to the time of the Illapel earthquake. The 1 m contour of the 2015 Illapel coseismic slip is plotted as black lines. Black dots are events of moment magnitude, Mw, >5.5. Green dots are the 86 repeating earthquakes. We identified three zones (outlined boxes) where most seismicity and repeaters are located. Red line is the trench B: Time-dependent cumulative (Cum.) seismicity for zone 1 (31°S–30°S, 72.5°W–71.8°W, black box in A), zone 2 (31°S–30°S, 71.8°W–71°W, green box in A), and zone 3 (32°S–31.2°S, 72.5°W–71.5°W, violet box in A). The squares are events with Mw > 5.5. Red line is the time of the Illapel earthquake C: Repeating events (blue dots) plotted as function of latitude (approximately along trench) and occurrence time. The red vertical dashed line is the time of the Illapel earthquake.]()
![Distribution of earthquakes as a function of magnitude for three consecutive years. Aftershock sequences of both Iquique 2014 and Illapel 2015 earthquakes have not been removed.]()
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1-20 OF 150 RESULTS FOR
Illapel earthquake 2015
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Journal Article
Complex Rupture of the 2015 M w 8.3 Illapel Earthquake and Prehistoric Events in the Central Chile Tsunami Gap
Journal: Seismological Research Letters
Publisher: Seismological Society of America
Published: 09 March 2022
Seismological Research Letters (2022) 93 (3): 1479–1496.
...Gabriel Easton; José González‐Alfaro; Angelo Villalobos; Gabriel Álvarez; Diego Melgar; Sergio Ruiz; Bernardo Sepúlveda; Manuel Escobar; Tomás León; Juan Carlos Báez; Tatiana Izquierdo; Maximiliano Forch; Manuel Abad Abstract On 16 September 2015, the M w 8.3 Illapel megathrust earthquake broke...
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Includes: Supplemental Content
Journal Article
Simulation of Pulse‐Like Ground Motions during the 2015 M w 8.3 Illapel Earthquake with a New Source Model Using Corrected Empirical Green’s Functions
Journal: Seismological Research Letters
Publisher: Seismological Society of America
Published: 22 September 2021
Seismological Research Letters (2022) 93 (1): 76–90.
...Claudio Fernández; Atsushi Nozu; Jorge G. F. Crempien; Juan Carlos de la Llera Abstract Pulse‐like near‐source ground motions were observed by the local network during the 2015 M w 8.3 Illapel, Chile earthquake. Such ground motions can be quite damaging to a wide range of infrastructures...
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Includes: Supplemental Content
Journal Article
Transient Viscosity and Afterslip of the 2015 M w 8.3 Illapel, Chile, Earthquake
Publisher: Seismological Society of America
Published: 29 October 2019
Bulletin of the Seismological Society of America (2019) 109 (6): 2567–2581.
...‐term deformation. In order to verify the validity of this assumption, the initial 1.5 months postseismic displacements following the 2015 M w 8.3 Illapel earthquake are analyzed based on a multilayered structure model. We explore the possible mechanisms, including afterslip and viscoelastic relaxation...
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Includes: Supplemental Content
Journal Article
The 2015 M w 8.3 Illapel, Chile, Earthquake: Direction‐Reversed Along‐Dip Rupture with Localized Water Reverberation
Publisher: Seismological Society of America
Published: 25 September 2017
Bulletin of the Seismological Society of America (2017) 107 (5): 2416–2426.
...Chao An; Han Yue; Jianbao Sun; Lingsen Meng; Juan Carlos Báez Abstract The kinematic rupture process of the 2015 Illapel, Chile, earthquake is investigated based on a joint inversion of teleseismic, Interferometric Synthetic Aperture Radar, Global Positioning System, and tsunami data, as well...
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Includes: Supplemental Content
Journal Article
Geotechnical Aspects of the 2015 M w 8.3 Illapel Megathrust Earthquake Sequence in Chile
Journal: Earthquake Spectra
Publisher: Earthquake Engineering Research Institute
Published: 01 May 2017
Earthquake Spectra (2017) 33 (2): 709–728.
...Gabriel Candia; Gregory P. de Pascale; Gonzalo Montalva; Christian Ledezma 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...
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Journal Article
The Seismic Sequence of the 16 September 2015 M w 8.3 Illapel, Chile, Earthquake
Journal: Seismological Research Letters
Publisher: Seismological Society of America
Published: 25 May 2016
Seismological Research Letters (2016) 87 (4): 789–799.
...Sergio Ruiz; Emilie Klein; Francisco del Campo; Efrain Rivera; Piero Poli; Marianne Metois; Vigny Christophe; Juan Carlos Baez; Gabriel Vargas; Felipe Leyton; Raúl Madariaga; Luce Fleitout ABSTRACT On 16 September 2015, the M w 8.3 Illapel, Chile, earthquake broke a large area of the Coquimbo...
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Includes: Supplemental Content
Image
Coseismic slip models of the 2015 M w 8.3 Illapel earthquake. (a) ...
in Near‐Real‐Time Finite‐Fault Inversions for Large Earthquakes in Chile Using Strong‐Motion Data
> Seismological Research Letters
Published: 14 August 2019
Figure 7. Coseismic slip models of the 2015 M w 8.3 Illapel earthquake. (a) Slip distribution based on the W ‐phase solution 6 min after origin time. (b) Slip distribution based on the W ‐phase solution 10 min after origin time. The color version of this figure is available only
Image
Slip distribution of the 2015 Illapel earthquake. (a) Coseismic slip distri...
in The Seismic Sequence of the 16 September 2015 M w 8.3 Illapel, Chile, Earthquake
> Seismological Research Letters
Published: 25 May 2016
Figure 7. Slip distribution of the 2015 Illapel earthquake. (a) Coseismic slip distribution inverted from static GPS displacements (difference between 17 September and 16 September) showing the discretization used in this work. (b) Checkerboard test for the finite source slip inversion using
Image
Vertical uplift produced by the 2015 Illapel earthquake. (a) Vertical displ...
in The Seismic Sequence of the 16 September 2015 M w 8.3 Illapel, Chile, Earthquake
> Seismological Research Letters
Published: 25 May 2016
Figure 8. Vertical uplift produced by the 2015 Illapel earthquake. (a) Vertical displacements on the surface predicted by our coseismic slip distribution. Black dots are geological observation of coastal uplift; the triangles are locations of GPS antennas. (b) White fringe of bleached
Image
Aftershocks of the 2015 Illapel earthquake. (a) Seismicity reported by CSN ...
in The Seismic Sequence of the 16 September 2015 M w 8.3 Illapel, Chile, Earthquake
> Seismological Research Letters
Published: 25 May 2016
Figure 9. Aftershocks of the 2015 Illapel earthquake. (a) Seismicity reported by CSN between 16 September 2015 and 30 September 2015. (b) Seismicity reported from CSN between 1 October 2015 and 10 December 2015. The open circles correspond to the seismicity shown in (a). Contours of the coseismic
Journal Article
High‐Frequency Rupture Processes of the 2014 M w 8.2 Iquique and 2015 M w 8.3 Illapel, Chile, Earthquakes Determined from Strong‐Motion Recordings
Publisher: Seismological Society of America
Published: 05 May 2022
Bulletin of the Seismological Society of America (2022) 112 (4): 1832–1852.
...Arthur Frankel ABSTRACT Strong‐motion recordings of the 2014 M w 8.2 Iquique and 2015 M w 8.3 Illapel, Chile, earthquakes were analyzed to determine rupture propagation and the location, timing, and strength of subevents that produce most of the high‐frequency (≥1 Hz) ground motions. A moving...
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Includes: Supplemental Content
Image
Tectonic setting and main geological features of the 2015 Illapel earthquak...
in Transient Viscosity and Afterslip of the 2015 M w 8.3 Illapel, Chile, Earthquake
> Bulletin of the Seismological Society of America
Published: 29 October 2019
Figure 1. Tectonic setting and main geological features of the 2015 Illapel earthquake. Blue triangles present the distribution of Global Positioning System (GPS) sites. Black contoured ellipses and red contoured ellipses refer to maximal rupture zones of historical megathrust earthquakes before
Image
Moment tensors of aftershocks of the 2015 Illapel earthquakes. (a) Moment t...
in The Seismic Sequence of the 16 September 2015 M w 8.3 Illapel, Chile, Earthquake
> Seismological Research Letters
Published: 25 May 2016
Figure 10. Moment tensors of aftershocks of the 2015 Illapel earthquakes. (a) Moment tensor determination for events of magnitude greater than M w 5.0 occurred between 16 September 2015 and 5 October 2015. The gray focal mechanisms are those interpreted as intraplate intermediate depth
Journal Article
Kinematics of Subduction Processes during the Earthquake Cycle in Central Chile
Journal: Seismological Research Letters
Publisher: Seismological Society of America
Published: 22 May 2019
Seismological Research Letters (2019) 90 (5): 1779–1791.
... to constrain kinematic models at subduction zones. Here, we analyze geodetic observations in central Chile, where two large earthquakes occurred: 2010 M w 8.8 Maule and 2015 M w 8.3 Illapel. We propose a model that considers the motion along both interfaces of the brittle subducting slab as the sources...
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Includes: Supplemental Content
Image
Regional 3D view of the continental margin along the Coquimbo–Illapel regio...
in Complex Rupture of the 2015 M w 8.3 Illapel Earthquake and Prehistoric Events in the Central Chile Tsunami Gap
> Seismological Research Letters
Published: 09 March 2022
Figure 9. Regional 3D view of the continental margin along the Coquimbo–Illapel region, showing the distribution of the vertical slip produced by the 2015 Illapel megathrust earthquake and seismic reflection data (modified from Contreras‐Reyes et al. , 2015 ; Melgar et al. , 2016 ), together
Image
(a) Rupture lengths of large interplate earthquakes ( M >7.6–7.7) since...
in Complex Rupture of the 2015 M w 8.3 Illapel Earthquake and Prehistoric Events in the Central Chile Tsunami Gap
> Seismological Research Letters
Published: 09 March 2022
megathrust earthquakes since the late nineteenth century; the red rectangle shows the rupture area of the 2015 Illapel earthquake. (c) Coseismic slip distribution of the 2015 Illapel megathrust earthquake (from Melgar et al. , 2016 ) and aftershocks during the first two weeks following this episode (from
Image
A: Seismicity in the Illapel area (Chile). The color map represents the log...
in The M w 8.3 Illapel earthquake (Chile): Preseismic and postseismic activity associated with hydrated slab structures
> Geology
Published: 01 March 2017
Figure 2. A: Seismicity in the Illapel area (Chile). The color map represents the logarithmic summation of the seismicity in a 0.1° grid from A.D. 1990 to the time of the Illapel earthquake. The 1 m contour of the 2015 Illapel coseismic slip is plotted as black lines. Black dots are events
Image
Distribution of earthquakes as a function of magnitude for three consecutiv...
Published: 14 February 2018
Figure 5. Distribution of earthquakes as a function of magnitude for three consecutive years. Aftershock sequences of both Iquique 2014 and Illapel 2015 earthquakes have not been removed.
Journal Article
Beyond the Teleseism: Introducing Regional Seismic and Geodetic Data into Routine USGS Finite‐Fault Modeling
Journal: Seismological Research Letters
Publisher: Seismological Society of America
Published: 04 August 2022
Seismological Research Letters (2022) 93 (6): 3308–3323.
... System (GNSS), and Interferometric Synthetic Aperture Radar (InSAR) observations in addition to teleseismic waveforms. We present joint inversion results for the 2015 M w 8.3 Illapel, Chile, earthquake, to confirm the method’s reliability. Next, we provide examples from recent earthquakes: the 29 July...
FIGURES
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Journal Article
Chile Strong Ground Motion Flatfile
Journal: Earthquake Spectra
Publisher: Earthquake Engineering Research Institute
Published: 01 November 2016
Earthquake Spectra (2016) 32 (4): 2549–2566.
..., which includes the recent 2015 M w 8.3 Illapel earthquake. The data set is controlled by subduction interface and inslab events. The oldest event included is Valparaiso (1985), and the magnitude span is 4.6–8.8 M w . The source-to-site distance metrics reported are the closest distance to the rupture...
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