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:10.1007/978-3-319-57822-4_2

Cited by 19 publications

(28 citation statements)

References 30 publications

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“…Comparison between our CS low‐frequency (circles) and high‐frequency (diamonds) coseismic radiation results and (a) coseismic slip Model 1 from EOS, (b) coseismic slip Model 2 from Ye et al . [], (c) coseismic slip Model 3 from Heidarzadeh et al . [] along with the (d–f) corresponding shear stress changes calculated from these slip models, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Colored regions show approximate rupture regions of three recent great earthquakes: 1960 M w 9.5 (yellow region) [from Moreno et al ., ]; 2010 M w 8.8 (blue region) [from Delouis et al ., ]; 2015 M w 8.3 (red region) (approximately from Ye et al . []) events. Gray shaded region indicates the position and extent of the subducting Juan Fernandez Ridge (JFR) [ Laursen et al ., ].…”

Section: Introductionmentioning

confidence: 99%

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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: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

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 1 April 2014 Iquique earthquake ruptured the same plate boundary around the Peru‐Chile border [ Ruiz et al ., ]. The 16 September 2015 Illapel earthquake occurred in a segment ~500 km north of the Maule earthquake [ Ye et al ., ]. Geographic latitudes of their epicenters are 36.1°S, 19.6°S, and 31.6°S, respectively, and their geomagnetic latitudes are lower by ~10°.…”

Section: Gps Data and Tec Analysis Proceduresmentioning

confidence: 99%

Three‐dimensional distribution of ionospheric anomalies prior to three large earthquakes in Chile

Heki

2016

Geophysical Research Letters

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Using regional Global Positioning System (GPS) networks, we studied three‐dimensional spatial structure of ionospheric total electron content (TEC) anomalies preceding three recent large earthquakes in Chile, South America, i.e., the 2010 Maule (Mw 8.8), the 2014 Iquique (Mw 8.2), and the 2015 Illapel (Mw 8.3) earthquakes. Both positive and negative TEC anomalies, with areal extent dependent on the earthquake magnitudes, appeared simultaneously 20–40 min before the earthquakes. For the two midlatitude earthquakes (2010 Maule and 2015 Illapel), positive anomalies occurred to the north of the epicenters at altitudes 150–250 km. The negative anomalies occurred farther to the north at higher altitudes 200–500 km. This lets the epicenter, the positive and negative anomalies align parallel with the local geomagnetic field, which is a typical structure of ionospheric anomalies occurring in response to positive surface electric charges.

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“…Almost two decades have passed since publication of the first geodetic results from the central Andes [e.g., Bevis et al , ; Brooks et al , ; Kendrick et al , ; Norabuena et al , ]. Now that more GPS data are available for the region and in the aftermath of numerous large submarine subduction zone earthquakes including the 2007 M w 7.7 Tocopilla, 2010 M w 8.8 Maule, 2014 M w 8.2 Pisagua, and 2015 M w 8.3 Illapel, Chile, earthquakes [ Delouis et al , ; Hayes et al , ; Moreno et al , ; Schurr et al , , ; Ye et al , ] we are better equipped to reexamine the effect of forearc earthquakes on the backarc velocity field and to assess locking and strain accumulation rates on the décollement beneath the active backarc orogenic wedge.…”

Section: Introductionmentioning

confidence: 99%

Isolating active orogenic wedge deformation in the southern Subandes of Bolivia

et al. 2016

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A new GPS‐derived surface velocity field for the central Andean backarc permits an assessment of orogenic wedge deformation across the southern Subandes of Bolivia, where recent studies suggest that great earthquakes (>Mw 8) are possible. We find that the backarc is not isolated from the main plate boundary seismic cycle. Rather, signals from subduction zone earthquakes contaminate the velocity field at distances greater than 800 km from the Chile trench. Two new wedge‐crossing velocity profiles, corrected for seasonal and earthquake affects, reveal distinct regions that reflect (1) locking of the main plate boundary across the high Andes, (2) the location of and loading rate at the back of orogenic wedge, and (3) an east flank velocity gradient indicative of décollement locking beneath the Subandes. Modeling of the Subandean portions of the profiles indicates along‐strike variations in the décollement locked width (WL) and wedge loading rate; the northern wedge décollement has a WL of ~100 km while accumulating slip at a rate of ~14 mm/yr, whereas the southern wedge has a WL of ~61 km and a slip rate of ~7 mm/yr. When compared to Quaternary estimates of geologic shortening and evidence for Holocene internal wedge deformation, the new GPS‐derived wedge loading rates may indicate that the southern wedge is experiencing a phase of thickening via reactivation of preexisting internal structures. In contrast, we suspect that the northern wedge is undergoing an accretion or widening phase primarily via slip on relatively young thrust‐front faults.

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

Cited by 19 publications

References 30 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

Three‐dimensional distribution of ionospheric anomalies prior to three large earthquakes in Chile

Isolating active orogenic wedge deformation in the southern Subandes of Bolivia

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

Cited by 19 publications

References 30 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

Three‐dimensional distribution of ionospheric anomalies prior to three large earthquakes in Chile

Isolating active orogenic wedge deformation in the southern Subandes of Bolivia

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Product

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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