Rapidly Estimated Seismic Source Parameters for the 16 September 2015 Illapel, Chile M w 8.3 Earthquake

Ye, Lingling; Lay, Thorne; Kanamori, Hiroo; Koper, Keith D.

doi:10.1007/s00024-015-1202-y

Cited by 73 publications

(24 citation statements)

References 33 publications

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“…Slip inversion results present some differences in slip patterns, despite similar technique and fault geometry they have used. For example, In the Slip Model 1 from EOS, the maximum slip region is located at the northern intermediate depth (~30 km) part of the fault with the maximum slip of about 6 m. In stark contrast, the maximum slip occurs at relatively shallower part (~20 km) in Model 2 [Ye et al, 2015] with the largest slip of about 8 m. Our LF radiation results are somewhat consistent with the large slip region of Models 2 and 3 [Heidarzadeh et al, 2015] (Figures 4b and 4c) but are located near the updip margin of the largest slip patch in Model 1 (Figure 4a). In comparison, the HF radiation is roughly following the margin of the largest coseismic slip in Models 1 and 2 (Figures 4a and 4b) but within the deeper rupture region of Model 3 (Figure 4c).…”

Section: Frequency-dependent Rupture Processmentioning

confidence: 99%

Coseismic radiation and stress drop during the 2015 M_w 8.3 Illapel, Chile megathrust earthquake

Yin

Yang

Yao

et al. 2016

Geophysical Research Letters

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On 16 September 2015, an Mw 8.3 earthquake struck middle Chile due to the subduction of the Nazca plate beneath the South America plate. This earthquake is the consequence of 72 years of strain accumulation in the region since the 1943 M 8.3 event. In this study, we apply the compressive sensing method (CS) to invert for the spatiotemporal distribution of the coseismic radiation at different frequencies of this event. The results show clear frequency‐dependent feature of earthquake rupture with low‐frequency (LF) radiation located in the updip region while high‐frequency (HF) radiation concentrated in the downdip region of the megathrust. We also compare the CS results with three coseismic slip models as well as the stress drop distributions inferred from these slip models. The comparison confirms our understanding of coseismic radiation that energy sources are mostly located in the margin of large coseismic slip regions. Furthermore, we find that the LF radiation sources are mainly within the stress‐decreasing (releasing) regions while the HF radiation sources are mainly located in the stress‐increasing (loading) regions due to rupturing of relatively large asperities nearby (stress decreasing and releasing). These results help to better understand the physics of the rupture process during megathrust earthquakes. Moreover, our results do not show radiation sources south of the epicenter, suggesting that the subducting Juan Fernandez Ridge probably stopped the rupture of this earthquake toward the south.

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Section: Frequency-dependent Rupture Processmentioning

confidence: 99%

Coseismic radiation and stress drop during the 2015 M_w 8.3 Illapel, Chile megathrust earthquake

Yin

Yang

Yao

et al. 2016

Geophysical Research Letters

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“…The 16 September 2015 Illapel, Chile, M w 8.3 megathrust earthquake has been extensively studied using seismic, geodetic, and tsunami data sets, and the rupture has been consistently characterized to involve a largeslip patch offshore extending from about 30°S to 31.6°S, with a secondary slip patch downdip below the coast [e.g., Heidarzadeh et al, 2016;Li et al, 2016;Ye et al, 2016;Yin et al, 2016]. The rupture has at least a 95 s duration and a seismic moment of about 3.…”

Section: Introductionmentioning

confidence: 99%

Modeling tsunami observations to evaluate a proposed late tsunami earthquake stage for the 16 September 2015 Illapel, Chile, M_w 8.3 earthquake

Lay

Cheung

2016

Geophysical Research Letters

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Resolving seaward extent of slip during great subduction zone interplate ruptures using land‐based seismological and geodetic observations is challenging. Modeling of tsunami recordings from ocean‐bottom pressure sensors of the Deep‐ocean Assessment and Reporting of Tsunami (DART) network has added valuable constraints on near‐trench slip for recent events. We use DART and tide gauge recordings to evaluate a proposed seismological scenario involving a late Mw 8.08 tsunami earthquake following the ~95 s long main rupture stage of the 16 September 2015 Illapel, Chile, Mw 8.3 earthquake. Tsunami observations constrain the spatial extent of any late tsunami earthquake slip to locate north of the main shock hypocenter. The proposed late shallow slip predicts tsunami signals with considerable amplitudes but shorter wavelengths compared to those of the main stage slip constrained by joint seismic and tsunami modeling, yielding overprediction of first‐arrival amplitudes at DART and tide gauge stations when the two stages are combined.

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“…Melgar et al (2016) reported two major slip episodes, which evolved with the same ~30 s delay of the shallow moment-release episode compared to the deep one. Ye et al (2016) obtained results characterized by a single patch. Despite different data sets and methods, our estimate of the low rupture speed is consistent with these (and other) independent studies.…”

Section: Resultsmentioning

confidence: 99%

Low-parametric modeling of the 2015, MW 8.3 Illapel, Chile earthquake

Bollini

Sabbione

Plicka

et al. 2018

Journal of South American Earth Sciences

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Rapidly Estimated Seismic Source Parameters for the 16 September 2015 Illapel, Chile M w 8.3 Earthquake

Cited by 73 publications

References 33 publications

Coseismic radiation and stress drop during the 2015 M_w 8.3 Illapel, Chile megathrust earthquake

Coseismic radiation and stress drop during the 2015 M_w 8.3 Illapel, Chile megathrust earthquake

Modeling tsunami observations to evaluate a proposed late tsunami earthquake stage for the 16 September 2015 Illapel, Chile, M_w 8.3 earthquake

Low-parametric modeling of the 2015, MW 8.3 Illapel, Chile earthquake

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Rapidly Estimated Seismic Source Parameters for the 16 September 2015 Illapel, Chile M w 8.3 Earthquake

Cited by 73 publications

References 33 publications

Coseismic radiation and stress drop during the 2015 Mw 8.3 Illapel, Chile megathrust earthquake

Coseismic radiation and stress drop during the 2015 Mw 8.3 Illapel, Chile megathrust earthquake

Modeling tsunami observations to evaluate a proposed late tsunami earthquake stage for the 16 September 2015 Illapel, Chile, Mw 8.3 earthquake

Low-parametric modeling of the 2015, MW 8.3 Illapel, Chile earthquake

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Coseismic radiation and stress drop during the 2015 M_w 8.3 Illapel, Chile megathrust earthquake

Coseismic radiation and stress drop during the 2015 M_w 8.3 Illapel, Chile megathrust earthquake

Modeling tsunami observations to evaluate a proposed late tsunami earthquake stage for the 16 September 2015 Illapel, Chile, M_w 8.3 earthquake