학술논문
Documentation of surface fault rupture and ground-deformation features produced by the 4 and 5 July 2019 Mw 6.4 and Mw 7.1 Ridgecrest earthquake sequence
Document Type
Academic Journal
Author
Daniel J. Ponti; James Luke Blair; Carla M. Rosa; Kate Thomas; Alexandra J. Pickering; Sinan Akciz; Stephen Angster; Jean-Philippe Avouac; Jeffrey Bachhuber; Steven Bacon; Nicolas Barth; Scott Bennett; Kelly Blake; Stephan Bork; Benjamin Brooks; Thomas Bullard; Paul Burgess; Colin Chupik; Timothy Dawson; Michael DeFrisco; Jaime Delano; Stephen DeLong; James Dolan; Andrea Donnellan; Christopher DuRoss; Todd Ericksen; Erik Frost; Gareth Funning; Ryan Gold; Nicholas Graehl; Carlos Gutierrez; Elizabeth Haddon; Alexandra Hatem; John Helms; Janis Hernandez; Christopher Hitchcock; Peter Holland; Kenneth Hudnut; Katherine Kendrick; Richard Koehler; Ozgur Kozaci; Tyler Ladinsky; Robert Leeper; Christopher Madugo; Maxime Mareschal; James McDonald; Devin McPhillips; Christopher Milliner; Daniel Mongovin; Alexander Morelan; Stephanie Nale; Johanna Nevitt; Matt O'Neal; Brian Olson; Michael Oskin; Salena Padilla; Jason Patton; Belle Philibosian; Ian Pierce; Cynthia Pridmore; Nathaniel Roth; David Sandwell; Katherine Scharer; Gordon Seitz; Drake Singleton; Bridget Smith-Konter; Eleanor Spangler; Brian Swanson; Jessica Thompson Jobe; Jerome Treiman; Francesca Valencia; Joshua Venderwal; Alana Williams; Xiaohua Xu; Judith Zachariasen; Jade Zimmerman; Robert Zinke
Source
Seismological Research Letters. 91(5):2942-2959
Subject
Language
English
ISSN
0895-0695
Abstract
The Mw 6.4 and Mw 7.1 Ridgecrest earthquake sequence occurred on 4 and 5 July 2019 within the eastern California shear zone of southern California. Both events produced extensive surface faulting and ground deformation within Indian Wells Valley and Searles Valley. In the weeks following the earthquakes, more than six dozen scientists from government, academia, and the private sector carefully documented the surface faulting and ground-deformation features. As of December 2019, we have compiled a total of more than 6000 ground observations; approximately 1500 of these simply note the presence or absence of fault rupture or ground failure, but the remainder include detailed descriptions and other documentation, including tens of thousands of photographs. More than 1100 of these observations also include quantitative field measurements of displacement sense and magnitude. These field observations were supplemented by mapping of fault rupture and ground-deformation features directly in the field as well as by interpreting the location and extent of surface faulting and ground deformation from optical imagery and geodetic image products. We identified greater than 68 km of fault rupture produced by both earthquakes as well as numerous sites of ground deformation resulting from liquefaction or slope failure. These observations comprise a dataset that is fundamental to understanding the processes that controlled this earthquake sequence and for improving earthquake hazard estimates in the region. This article documents the types of data collected during postearthquake field investigations, the compilation effort, and the digital data products resulting from these efforts.