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Joint modeling of teleseismic and tsunami wave observations to constrain the 16 September 2015 Illapel, Chile, M_w 8.3 earthquake rupture process

Li, Linyan and Lay, Thorne and Cheung, Kwok Fai and Ye, Lingling (2016) Joint modeling of teleseismic and tsunami wave observations to constrain the 16 September 2015 Illapel, Chile, M_w 8.3 earthquake rupture process. Geophysical Research Letters, 43 (9). pp. 4303-4312. ISSN 0094-8276. http://resolver.caltech.edu/CaltechAUTHORS:20160715-081246854

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Abstract

The 16 September 2015 Illapel, Chile, M_w 8.3 earthquake ruptured ~170 km along the plate boundary megathrust fault from 30.0°S to 31.6°S. A patch of offshore slip of up to 10 m extended to near the trench, and a patch of ~3 m slip occurred downdip below the coast. Aftershocks fringe the large-slip zone, extending along the coast from 29.5°S to 32.5°S between the 1922 and 1971/1985 ruptures. The coseismic slip distribution is determined by iterative modeling of teleseismic body waves as well as tsunami signals recorded at three regional DART stations and tide gauges immediately north and south of the rupture. The tsunami observations tightly delimit the rupture length, suppressing bilateral southward extension of slip found in unconstrained teleseismic-wave inversions. The spatially concentrated rupture area, with a stress drop of ~3.2 MPa, is validated by modeling DART and tide gauge observations in Hawaii, which also prove sensitive to the along-strike length of the rupture.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1002/2016GL068674DOIArticle
http://onlinelibrary.wiley.com/doi/10.1002/2016GL068674/abstractPublisherArticle
ORCID:
AuthorORCID
Lay, Thorne0000-0003-2360-4213
Cheung, Kwok Fai0000-0002-7435-0500
Ye, Lingling0000-0002-8739-2072
Additional Information:© 2016 American Geophysical Union. Received 15 MAR 2016; Accepted 19 APR 2016; Accepted article online 20 APR 2016; Published online 7 MAY 2016. The IRIS DMS data center (http://www.iris.edu/hq/) was used to access the seismic data from Global Seismic Network and Federation of Digital Seismic Network stations. The DART and tide gauge data were downloaded from the NOAA National Data Buoy Center (http://www.ndbc.noaa.gov/) and CO-OPS Tsunami Capable Tide Stations (http://tidesandcurrents.noaa.gov/tsunami/). This data analysis made use of GMT, SAC, and Matlab software. This work was supported by NOAA grant NA15NWS4670025 to Kwok Fai Cheung and by NSF grant EAR1245717 to Thorne Lay. This is SOEST contribution 9610.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
National Oceanic and Atmospheric Administration (NOAA) NA15NWS4670025
NSFEAR-1245717
Subject Keywords:earthquake rupture; tsunami; tsunami modeling; finite-fault inversion
Record Number:CaltechAUTHORS:20160715-081246854
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160715-081246854
Official Citation:Li, L., T. Lay, K. F. Cheung, and L. Ye (2016), Joint modeling of teleseismic and tsunami wave observations to constrain the 16 September 2015 Illapel, Chile, Mw 8.3 earthquake rupture process, Geophys. Res. Lett., 43, 4303–4312, doi:10.1002/2016GL068674.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:69044
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:27 Jul 2016 21:17
Last Modified:06 Oct 2017 23:22

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