Kinematic rupture process of the 2014 Chile<i>M</i><sub>w</sub>8.1 earthquake constrained by strong-motion, GPS static offsets and teleseismic data

Liu, Chengli; Zheng, Yong; Wang, Rongjiang; Xiong, Xiong

doi:10.1093/gji/ggv214

Cited by 17 publications

(19 citation statements)

References 30 publications

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“…This feature is consistent with the slip model of Liu et al [2015] and the two groups of high-frequency sources reported by Meng et al [2015]. As for the main shock, tsunami data is useful to constrain the absence of slip close to the trench.…”

Section: Static Modeling Of the M W = 77 Aftershocksupporting

confidence: 86%

“…Blue and red circles are respectively foreshocks and aftershocks of magnitude 4 < M < 6 from the CSN catalog (1 January 2014 to 4 February 2014 and 1 April 2014 to 9 April 2014). Ruiz et al, 2014], GPS static data, tsunami records , or a combination of these observations [Hayes et al, 2014;Schurr et al, 2014;Gusman et al, 2015;Lay et al, 2014;Liu et al, 2015]. These models show similar first-order features but also significant differences such as the amplitude, extent, location, and updip limit of the primary slip zone (cf., Figure S2).…”

Section: Introductionmentioning

confidence: 94%

“…The point source solutions shown in Figure 1 are similar to those found in the Global Centroid Moment Tensor (GCMT) catalog. Ruiz et al, 2014], GPS static data, tsunami records , or a combination of these observations [Hayes et al, 2014;Schurr et al, 2014;Gusman et al, 2015;Lay et al, 2014;Liu et al, 2015]. Red contours are area of ruptures of the 1995 M w = 8.1 Antofagasta, the 2001 M w = 8.4 Arequipa, and the 2007 M w = 7.7 Tocopilla earthquakes [Pritchard et al, 2006[Pritchard et al, , 2007Béjar-Pizarro et al, 2010].…”

Section: Introductionmentioning

confidence: 99%

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The Iquique earthquake sequence of April 2014: Bayesian modeling accounting for prediction uncertainty

Duputel

Jiang

Jolivet

et al. 2015

Geophysical Research Letters

103

105

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The subduction zone in northern Chile is a well‐identified seismic gap that last ruptured in 1877. On 1 April 2014, this region was struck by a large earthquake following a two week long series of foreshocks. This study combines a wide range of observations, including geodetic, tsunami, and seismic data, to produce a reliable kinematic slip model of the Mw=8.1 main shock and a static slip model of the Mw=7.7 aftershock. We use a novel Bayesian modeling approach that accounts for uncertainty in the Green's functions, both static and dynamic, while avoiding nonphysical regularization. The results reveal a sharp slip zone, more compact than previously thought, located downdip of the foreshock sequence and updip of high‐frequency sources inferred by back‐projection analysis. Both the main shock and the Mw=7.7 aftershock did not rupture to the trench and left most of the seismic gap unbroken, leaving the possibility of a future large earthquake in the region.

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Section: Static Modeling Of the M W = 77 Aftershocksupporting

confidence: 86%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Iquique earthquake sequence of April 2014: Bayesian modeling accounting for prediction uncertainty

Duputel

Jiang

Jolivet

et al. 2015

Geophysical Research Letters

103

105

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“…al., 2015;Gusman et al, 2015;Hayes et al, 2014;Liu et al, 2015;Schurr et al, 2014;Yagi et al, 2014]. For the main shock, the crack-based 2 m slip contour shows spatial overlap that from with other estimates, while the peak slip is located around 70.9°W, 5°S, northwest of that derived from other data sets(Figure 2a).…”

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confidence: 62%

Slip distribution of the 2014 M_w = 8.1 Pisagua, northern Chile, earthquake sequence estimated from coseismic fore‐arc surface cracks

Loveless

Scott

Allmendinger

et al. 2016

Geophysical Research Letters

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The 2014 Mw = 8.1 Iquique (Pisagua), Chile, earthquake sequence ruptured a segment of the Nazca‐South America subduction zone that last hosted a great earthquake in 1877. The sequence opened >3700 surface cracks in the fore arc of decameter‐scale length and millimeter‐to centimeter‐scale aperture. We use the strikes of measured cracks, inferred to be perpendicular to coseismically applied tension, to estimate the slip distribution of the main shock and largest aftershock. The slip estimates are compatible with those based on seismic, geodetic, and tsunami data, indicating that geologic observations can also place quantitative constraints on rupture properties. The earthquake sequence ruptured between two asperities inferred from a regional‐scale distribution of surface cracks, interpreted to represent a modal or most common rupture scenario for the northern Chile subduction zone. We suggest that past events, including the 1877 earthquake, broke the 2014 Pisagua source area together with adjacent sections in a throughgoing rupture.

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“…It therefore suggests that the shallow part of subduction zone has the potential to fail coseismically, if the shallow conditionally stable zone contains large asperities. Interestingly, it has been demonstrated that the 2010 M w 8.8 Maule earthquake (Yue et al, ), the 2014 M w 8.1 Iquique earthquake (Liu et al, ), and the 2016 M w 7.8 Pedernales earthquake (Nocquet et al, ) indicate small or heterogeneous shallow rupture. This phenomenon raises thought‐provoking questions about the physical properties of the shallow subduction zone and the potential seismic and tsunami hazard of the Chile‐Peru trench, so further works are needed to investigate the relationships between crustal structure, morphology (e.g., accretionary prism and continental framework), trench‐parallel gravity anomaly, and large coseismic slip.…”

Section: Discussionmentioning

confidence: 99%

Insights Into the Kinematic Rupture of the 2015 M_w 8.3 Illapel, Chile, Earthquake From Joint Analysis of Geodetic, Seismological, Tsunami, and Superconductive Gravimeter Observations

Liu

Shan

et al. 2018

JGR Solid Earth

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We investigated the spatiotemporal slip distribution of the 2015 Illapel earthquake (Mw = 8.3) by joint analyses of geodetic, seismological, tsunami, and superconductive gravimeter observations. The coseismic rupture directly overlaps the interseismic coupling zone determined by onshore geodetic measurements. The main slip asperity is located north of the hypocenter with a peak slip of ~9.2 m, and the rupture spans ~200 km along strike and ~150 km along dip with an average rupture speed of ~2.0 km/s. Most aftershocks reveal a clear complementary distribution with the coseismic rupture; that is, aftershock clusters are located at the border of unbroken barriers and regions of sudden transition from high to low rupture area. The calculated Coulomb failure stress changes indicate that 80% of the aftershocks were triggered by the main event. The low‐frequency radiation corresponds to the large coseismic rupture at the shallow portion of the megathrust, while the high‐frequency radiation is associated with the edge of large slip asperity or an isolated patch at a deeper position. The large coseismic slip region correlates well with the high Vp/Vs ratio of the subduction interface, which implies that the Illapel earthquake might nucleate at a relatively weak patch within a strong coupled zone. Furthermore, we argue that the coseismic slip did reach to the trench from tsunami simulations, and historical earthquakes analyses indicate a complex strain accumulation and release in central Chile.

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Kinematic rupture process of the 2014 ChileM_w8.1 earthquake constrained by strong-motion, GPS static offsets and teleseismic data

Cited by 17 publications

References 30 publications

The Iquique earthquake sequence of April 2014: Bayesian modeling accounting for prediction uncertainty

The Iquique earthquake sequence of April 2014: Bayesian modeling accounting for prediction uncertainty

Slip distribution of the 2014 M_w = 8.1 Pisagua, northern Chile, earthquake sequence estimated from coseismic fore‐arc surface cracks

Insights Into the Kinematic Rupture of the 2015 M_w 8.3 Illapel, Chile, Earthquake From Joint Analysis of Geodetic, Seismological, Tsunami, and Superconductive Gravimeter Observations

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Kinematic rupture process of the 2014 ChileMw8.1 earthquake constrained by strong-motion, GPS static offsets and teleseismic data

Cited by 17 publications

References 30 publications

The Iquique earthquake sequence of April 2014: Bayesian modeling accounting for prediction uncertainty

The Iquique earthquake sequence of April 2014: Bayesian modeling accounting for prediction uncertainty

Slip distribution of the 2014 Mw = 8.1 Pisagua, northern Chile, earthquake sequence estimated from coseismic fore‐arc surface cracks

Insights Into the Kinematic Rupture of the 2015 Mw 8.3 Illapel, Chile, Earthquake From Joint Analysis of Geodetic, Seismological, Tsunami, and Superconductive Gravimeter Observations

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Kinematic rupture process of the 2014 ChileM_w8.1 earthquake constrained by strong-motion, GPS static offsets and teleseismic data

Slip distribution of the 2014 M_w = 8.1 Pisagua, northern Chile, earthquake sequence estimated from coseismic fore‐arc surface cracks

Insights Into the Kinematic Rupture of the 2015 M_w 8.3 Illapel, Chile, Earthquake From Joint Analysis of Geodetic, Seismological, Tsunami, and Superconductive Gravimeter Observations