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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

Arthur Frankel
Published: 05 May 2022
Bulletin of the Seismological Society of America (2022) 112 (4): 1832–1852.
DOI: https://doi.org/10.1785/0120210331
...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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View PDF for article title, High‐Frequency Rupture Processes of the 2014 M w 8.2 Iquique and 2015 M w 8.3 <span class="search-highlight">Illapel</span>, <span class="search-highlight">Chile</span>, Earthquakes Determined from Strong‐Motion Recordings
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Journal Article

Transient Viscosity and Afterslip of the 2015 M w 8.3 Illapel, Chile, Earthquake

Rumeng Guo, Yong Zheng, Jianqiao Xu, Muhammad Shahid Riaz
Published: 29 October 2019
Bulletin of the Seismological Society of America (2019) 109 (6): 2567–2581.
DOI: https://doi.org/10.1785/0120190114
.... Riquelme S. , and Stressler B. J. 2016 . Coseismic slip and early afterslip of the 2015 Illapel, Chile, earthquake: Implications for frictional heterogeneity and coastal uplift , J. Geophys. Res. 121 , no.  8 , 6172 – 6191 , doi: 10.1002/2016JB013124 . Beck S. Barrientos S...
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View PDF for article title, Transient Viscosity and Afterslip of the 2015 M w 8.3 <span class="search-highlight">Illapel</span>, <span class="search-highlight">Chile</span>, Earthquake
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Journal Article

The 2015 M w 8.3 Illapel, Chile, Earthquake: Direction‐Reversed Along‐Dip Rupture with Localized Water Reverberation

Chao An, Han Yue, Jianbao Sun, Lingsen Meng, Juan Carlos Báez
Published: 25 September 2017
Bulletin of the Seismological Society of America (2017) 107 (5): 2416–2426.
DOI: https://doi.org/10.1785/0120160393
...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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View PDF for article title, The 2015 M w 8.3 <span class="search-highlight">Illapel</span>, <span class="search-highlight">Chile</span>, Earthquake: Direction‐Reversed Along‐Dip Rupture with Localized Water Reverberation
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Journal Article

The Seismic Sequence of the 16 September 2015 M w 8.3 Illapel, Chile, Earthquake

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
Published: 25 May 2016
Seismological Research Letters (2016) 87 (4): 789–799.
DOI: https://doi.org/10.1785/0220150281
...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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View PDF for article title, The Seismic Sequence of the 16 September 2015 M w 8.3 <span class="search-highlight">Illapel</span>, <span class="search-highlight">Chile</span>, Earthquake
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Journal Article

The M w 8.3 Illapel earthquake (Chile): Preseismic and postseismic activity associated with hydrated slab structures

Piero Poli, Andrei Maksymowicz, Sergio Ruiz
Journal: Geology
Published: 01 March 2017
Geology (2017) 45 (3): 247–250.
DOI: https://doi.org/10.1130/G38522.1
... of America 2017 On 16 September 2015, a M w 8.3 earthquake struck the north-central Chile subduction zone near the city of Illapel. This event broke a 150 × 100 km area ( Melgar et al., 2016 ; Tilmann et al., 2016 ; Ruiz et al., 2016 ), and terminated to the north and to the south at two low...
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View PDF for article title, The M w 8.3 <span class="search-highlight">Illapel</span> earthquake (<span class="search-highlight">Chile</span>): Preseismic and postseismic activity associated with hydrated slab structures
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Journal Article

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

Gabriel Candia, Gregory P. de Pascale, Gonzalo Montalva, Christian Ledezma
Published: 01 May 2017
Earthquake Spectra (2017) 33 (2): 709–728.
DOI: https://doi.org/10.1193/031716EQS043M
...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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View PDF for article title, Geotechnical Aspects of the 2015 M w 8.3 <span class="search-highlight">Illapel</span> Megathrust Earthquake Sequence in <span class="search-highlight">Chile</span>
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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

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
Published: 09 March 2022
Seismological Research Letters (2022) 93 (3): 1479–1496.
DOI: https://doi.org/10.1785/0220210283
... in central and northern Chile and the implications for regional and pan‐Pacific tsunami hazard assessments. Figure 5. Comparison between (a) coseismic vertical movements experienced by the coastline during the 2015 Illapel earthquake, (b) tsunami run‐ups, and (c) aftershock seismicity associated...
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View PDF for article title, Complex Rupture of the 2015 M w 8.3 <span class="search-highlight">Illapel</span> Earthquake and Prehistoric Events in the Central <span class="search-highlight">Chile</span> Tsunami Gap
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The seismotectonic setting of the Illapel (Chile) earthquake region. A: The oceanic Nazca plate structures and the Chilean National Seismological Center (CSN) catalog seismicity (black dots) are presented over a satellite-swath bathymetry elevation model. Magenta lines indicate the directions of the magnetic fabric in the Nazca plate. Red lines highlight the structures generated at the spreading center during the slab formation, and black lines show the outer-rise faulting observed in the swath bathymetry. The red star is the epicenter of the Illapel earthquake, and blue curves correspond to the slip contours (each 1 m) of the Illapel earthquake according to Ruiz et al. (2016). Gray lines highlight the traces of the Challenger Fracture Zone (F.Z.) and Juan Fernández ridge. B: Rupture lengths of historic earthquakes. Gray hachured areas are low coupling zones from Métois et al. (2016). LCZ—low interseismic coupling zone.

The seismotectonic setting of the Illapel (Chile) earthquake region. A: The...

Published: 01 March 2017
Figure 1. The seismotectonic setting of the Illapel (Chile) earthquake region. A: The oceanic Nazca plate structures and the Chilean National Seismological Center (CSN) catalog seismicity (black dots) are presented over a satellite-swath bathymetry elevation model. Magenta lines indicate
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

Claudio Fernández, Atsushi Nozu, Jorge G. F. Crempien, Juan Carlos de la Llera
Published: 22 September 2021
Seismological Research Letters (2022) 93 (1): 76–90.
DOI: https://doi.org/10.1785/0220200446
...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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Journal Article

Beyond the Teleseism: Introducing Regional Seismic and Geodetic Data into Routine USGS Finite‐Fault Modeling

Dara E. Goldberg, Pablo Koch, Diego Melgar, Sebastian Riquelme, William L. Yeck
Published: 04 August 2022
Seismological Research Letters (2022) 93 (6): 3308–3323.
DOI: https://doi.org/10.1785/0220220047
... 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...
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Conceptual model for the hydrated structures and seismicity at the interplate boundary. The figure presents a hypothetical view from the southeast. The red star is the epicenter of the Illapel (Chile) earthquake, blue circles exemplify repeating and swarm, and the blue area represents the associated rupture zone. On the subducted slab, the red lines are the structures generated during the slab formation, and black lines show the faults generated at the outer-rise zone. According to the model, some of these structures (bold lines) release fluids to the contact, favoring the generation of swarms and repeaters. In particular, the Illapel earthquake was stopped to the south by some of these hydrated structures, parallel to the Juan Fernández ridge (JFR) direction. F.Z.—fracture zone.

Conceptual model for the hydrated structures and seismicity at the interpla...

Published: 01 March 2017
Figure 3. Conceptual model for the hydrated structures and seismicity at the interplate boundary. The figure presents a hypothetical view from the southeast. The red star is the epicenter of the Illapel (Chile) earthquake, blue circles exemplify repeating and swarm, and the blue area represents
Image
(a) Vertical‐component record section showing recordings at MAGIC stations of the September 2015 magnitude 8.3 earthquake near Illapel, Chile. Major body‐ and surface‐wave phases are labeled. (b) Map of teleseismic events (yellow stars) of magnitude 5.8 and greater at epicentral distances beyond 40° (black circle) during the time of the deployment (October 2013–October 2016). The center of the MAGIC array is marked with a red triangle. The color version of this figure is available only in the electronic edition.

(a) Vertical‐component record section showing recordings at MAGIC stations ...

Published: 01 July 2020
Figure 6. (a) Vertical‐component record section showing recordings at MAGIC stations of the September 2015 magnitude 8.3 earthquake near Illapel, Chile. Major body‐ and surface‐wave phases are labeled. (b) Map of teleseismic events (yellow stars) of magnitude 5.8 and greater at epicentral
Image
Global Navigational Satellite System (GNSS) position waveform time series and coseismic offsets (inset) for the (a) 2016 Mw 7.8 Kaikoura, New Zealand, (b) 2011 Mw 9.1 Tohoku, Japan, (c) 2010 Mw 8.8 Maule, and (d) 2015 Mw 8.3 Illapel, Chile, earthquakes. Traces that show the component of motion with the largest coseismic offset are sorted by increasing distance from epicenter and are offset vertically for clarity. Blue lines indicate even origin time; each receiver position trace is colored separately. Note differences in y‐axis scales and component of motion shown. Tohoku point positions processed by Central Washington University, others from Ruhl et al. (2018).

Global Navigational Satellite System (GNSS) position waveform time series a...

Published: 11 May 2021
Figure 1. Global Navigational Satellite System (GNSS) position waveform time series and coseismic offsets (inset) for the (a) 2016 M w  7.8 Kaikoura, New Zealand, (b) 2011 M w  9.1 Tohoku, Japan, (c) 2010 M w  8.8 Maule, and (d) 2015 M w  8.3 Illapel, Chile
Journal Article

Kinematics of Subduction Processes during the Earthquake Cycle in Central Chile

Leonardo Aguirre, Klaus Bataille, Camila Novoa, Carlos Peña, Felipe Vera
Published: 22 May 2019
Seismological Research Letters (2019) 90 (5): 1779–1791.
DOI: https://doi.org/10.1785/0220180391
... 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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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, &gt;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 &gt; 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.

A: Seismicity in the Illapel area (Chile). The color map represents the log...

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
Journal Article

G‐FAST Earthquake Early Warning Potential for Great Earthquakes in Chile

Brendan W. Crowell, David A. Schmidt, Paul Bodin, John E. Vidale, Ben Baker, Sergio Barrientos, Jianghui Geng
Published: 07 February 2018
Seismological Research Letters (2018) 89 (2A): 542–556.
DOI: https://doi.org/10.1785/0220170180
.... Ishibe T. , and Gusman A. R. 2016 . Source model of the 16 September 2015 Illapel, Chile, M w  8.4 earthquake based on teleseismic and tsunami data , Geophys. Res. Lett. 43 , no.  2 , 643 – 650 , doi: 10.1002/2015GL067297 . Ichinose G. A. Thio H. K. , and Somerville...
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View PDF for article title, G‐FAST Earthquake Early Warning Potential for Great Earthquakes in <span class="search-highlight">Chile</span>
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Journal Article

Earthquakes Felt in the Juan Fernandez Islands: Where Are They Coming from?

Sebastián Carrasco, Sergio Ruiz, Miguel Sáez
Published: 13 November 2019
Seismological Research Letters (2020) 91 (1): 262–271.
DOI: https://doi.org/10.1785/0220190151
... seismological station of the National Seismological Center of University of Chile (CSN) has been running since 2014 on RCI. The strong‐motion instrument and the broadband seismometer have recorded several large‐magnitude earthquakes from the Chile–Peru trench such as the 2015 M w  8.3 Illapel, 2016...
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Joint regional and teleseismic inversion results for 16 September 2015, Illapel, Chile, earthquake. (a) Map view of fault slip with hypocenter represented with a star and red bound indicating the up‐dip edge, next to the location of the trench (thick white line). Locations of strong‐motion accelerometers (white inverted triangles), high‐rate Global Navigation Satellite System (GNSS; dark blue triangles), and static GNSS observations (black arrows) with static synthetics (red arrows) are shown. Observed waveforms (black) and synthetic fits (red) to accelerometer station GO04 are shown to the top right. Observed waveforms (black) and synthetic fits (red) to high‐rate GNSS site PFRJ are shown toward the top left. Numbers on the right side of the waveform plots give the maximum amplitudes (in centimeters/second for GO04 and centimeters for PFRJ) for the observed and synthetic waveforms in black and red, respectively. Component is given in the top left corner of the waveform plots. The thinner lines in component LXZ indicate the lower weight that the vertical GNSS is given in the inversion. The solid vertical line denotes origin time, with subsequent dotted lines every 20 s. All station fits and Interferometric Synthetic Aperture Radar (InSAR) fits are available in Goldberg et al. (2022). Slip color bar is in the top right. (b) Modeled fault slip in along‐strike (6°) and along‐dip (19°) directions. The star indicates hypocenter location with rupture front contours plotted in gray every 10 s. The gray arrows indicate the rake direction. Colorbar is the same as subplot panel (a). (c) Moment rate function. The dashed red line indicates the interpreted end of the event. Mr, moment rate; Mw, moment magnitude; and M0, seismic moment.

Joint regional and teleseismic inversion results for 16 September 2015, Ill...

Published: 04 August 2022
Figure 1. Joint regional and teleseismic inversion results for 16 September 2015, Illapel, Chile, earthquake. (a) Map view of fault slip with hypocenter represented with a star and red bound indicating the up‐dip edge, next to the location of the trench (thick white line). Locations of strong
Journal Article

A Revised Chilean Seismic Catalog from 1982 to Mid‐2020

Bertrand Potin, Sergio Ruiz, Florent Aden‐Antoniow, Raúl Madariaga, Sergio Barrientos
Published: 04 September 2024
Seismological Research Letters (2025) 96 (1): 484–498.
DOI: https://doi.org/10.1785/0220240047
.... , 2020 ). In north‐central Chile persistent clusters were observed around the 2015 M w  8.3 Illapel earthquake ( Ruiz et al. , 2016 ; Frank et al. , 2017 ; Poli et al. , 2017 ; Huang and Meng, 2018 ). Poli et al. (2017) proposed that these persistent clusters are related with hydrated...
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Journal Article

Ground‐Motion Evaluation of Moderate and Large Interface Earthquakes along the Chilean Subduction Zone

Carlos Herrera, John F. Cassidy, Stan E. Dosso, Nicolás Bastías, Tuna Onur
Published: 01 September 2020
Bulletin of the Seismological Society of America (2020) 110 (6): 2693–2710.
DOI: https://doi.org/10.1785/0120190265
... by the 2007 M w  7.7 Tocopilla and 2014 M w  8.1 Iquique earthquakes (see map and graphs in Fig.  1a ). In central Chile, 2928 observations from 207 M w ≥ 4.8 earthquakes were obtained, which constitutes the largest regional data set. The 2015 M w  8.3 Illapel earthquake...
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