The Weitin Fault, Papua New Guinea, Ruptured Twice by Mw 8.0 and Mw 7.7 Earthquakes in 2000 and 2019

Kejie Chen; Chris Milliner; Jean Philippe Avouac

doi:10.1029/2019GL084645

The Weitin Fault, Papua New Guinea, Ruptured Twice by M_w 8.0 and M_w 7.7 Earthquakes in 2000 and 2019

Kejie Chen
, Chris Milliner
, Jean Philippe Avouac

School of Geog & Environmental Scs

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

We determine the fault geometry and kinematic slip models of the 2019 M_w 7.7 and 2000 M_w 8.0 earthquakes in Papua New Guinea using measurements from optical image correlation and teleseismic waveforms. The 2000 earthquake ruptured an extensive fault system over a distance of ~150 km including the entire 60-km long onshore segment of the Weitin fault and its offshore continuation southeast of New Ireland. The northern portion of the onshore Weitin fault segment ruptured again in 2019. Most of the moment was released by a compact, shallow, high stress-drop slip patch on the northwestern continuation of the Weitin fault in the Saint George Channel, which was brought closer to failure by the 2000 earthquake. The two ruptures overlap over about 20 km but in fact mostly complement each other. Large dynamic stresses may have driven the partial rerupture of the Weitin fault during the 2019 event.

Original language	English
Pages (from-to)	12833-12840
Number of pages	8
Journal	Geophysical Research Letters
Volume	46
Early online date	19 Nov 2019
DOIs	https://doi.org/10.1029/2019GL084645
Publication status	Published online - 19 Nov 2019

Funding

Kejie Chen [email protected] Chris Milliner Jean‐Philippe Avouac Division of Geological and Planetary Sciences California Institute of Technology Pasadena CA USA Department of Earth and Space Sciences Southern University of Science and Technology Shenzhen, Guangdong China Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA National Science Foundation (NSF) EAR‐182185 Supporting Information S1 Data Set S1 Data Set S2 Data Set S3 Data Set S4 ). Part of this research was supported by the National Aeronautics and Space Administration, and performed at the Jet Propulsion Laboratory, California Institute of Technology. This research was partially funded by the National Science Foundation through grant EAR‐182185. We thank Gavin Hayes (the Editor), Sotiris Valkaniotis and Edwin Nissen for their constructive reviews. Teleseimic waveforms were obtained through the Data Management Center of the Incorporated Research Institutions for Seismology. Landsat‐7 images were provided by U.S. Geological Survey ( https://earthexplorer.usgs.gov/ ), and Sentinel 2 was from European Space Agency Copernicus program ( https://scihub.copernicus.eu/ ). Most of the figures in this paper were prepared using Generic Mapping Tools (Wessel et al.,

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abstract = "We determine the fault geometry and kinematic slip models of the 2019 Mw 7.7 and 2000 Mw 8.0 earthquakes in Papua New Guinea using measurements from optical image correlation and teleseismic waveforms. The 2000 earthquake ruptured an extensive fault system over a distance of \textasciitilde{}150 km including the entire 60-km long onshore segment of the Weitin fault and its offshore continuation southeast of New Ireland. The northern portion of the onshore Weitin fault segment ruptured again in 2019. Most of the moment was released by a compact, shallow, high stress-drop slip patch on the northwestern continuation of the Weitin fault in the Saint George Channel, which was brought closer to failure by the 2000 earthquake. The two ruptures overlap over about 20 km but in fact mostly complement each other. Large dynamic stresses may have driven the partial rerupture of the Weitin fault during the 2019 event.",

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The Weitin Fault, Papua New Guinea, Ruptured Twice by M_w 8.0 and M_w 7.7 Earthquakes in 2000 and 2019

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