| NSF Org: |
EAR Division Of Earth Sciences |
| Recipient: |
|
| Initial Amendment Date: | July 26, 2019 |
| Latest Amendment Date: | July 26, 2019 |
| Award Number: | 1945760 |
| Award Instrument: | Standard Grant |
| Program Manager: |
Robin Reichlin
EAR Division Of Earth Sciences GEO Directorate for Geosciences |
| Start Date: | August 1, 2019 |
| End Date: | July 31, 2020 (Estimated) |
| Total Intended Award Amount: | $17,000.00 |
| Total Awarded Amount to Date: | $17,000.00 |
| Funds Obligated to Date: |
|
| History of Investigator: |
|
| Recipient Sponsored Research Office: |
8622 DISCOVERY WAY # 116 LA JOLLA CA US 92093-1500 (858)534-1293 |
| Sponsor Congressional District: |
|
| Primary Place of Performance: |
8602 La Jolla Shores Dr La Jolla CA US 92093-0210 |
| Primary Place of
Performance Congressional District: |
|
| Unique Entity Identifier (UEI): |
|
| Parent UEI: |
|
| NSF Program(s): | XC-Crosscutting Activities Pro |
| Primary Program Source: |
|
| Program Reference Code(s): |
|
| Program Element Code(s): |
|
| Award Agency Code: | 4900 |
| Fund Agency Code: | 4900 |
| Assistance Listing Number(s): | 47.050 |
ABSTRACT
This project will support rapid geologic, geodetic and seismological field investigations associated with the Searles Valley earthquake sequence in the Eastern California Shear Zone, which included a magnitude (M) 6.4 earthquake on July 4, 2019, and a subsequent M 7.1 event on July 5. The immediate field response is essential because the seismic and geodetic signals decay rapidly with time and geological evidence becomes obscure quickly. Rapid field studies should provide a wealth of data to facilitate understanding of the earthquake rupture properties and fault damage zones, 3D crustal structures around the ruptures, post seismic transients of geodetic fields, and effects of the events on the subsurface and human structures. This study should help clarify earthquake processes and structures in the highly active and complex Eastern California Shear Zone, which hosted three M > 7 events in the last three decades, and contribute significantly to improved understanding of the tectonic deformation and seismic hazard in Southern California. The field studies and recorded data will provide valuable experience for students and early career scientists, and produce excellent material for education and outreach activities.
This study will include obtaining differential lidar and optical image surveys, campaign Global Positioning System measurements, seismic deployments of across-fault linear and 2D arrays, and mapping effects of the ground motion on infrastructure. The obtained multi-disciplinary observations will enable researchers to address numerous outstanding questions about earthquake ruptures, spatio-temporal seismicity patterns, fault zone and crustal structures, intensity of ground shaking and postseismic deformation.
This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH
Note:
When clicking on a Digital Object Identifier (DOI) number, you will be taken to an external
site maintained by the publisher. Some full text articles may not yet be available without a
charge during the embargo (administrative interval).
Some links on this page may take you to non-federal websites. Their policies may differ from
this site.
PROJECT OUTCOMES REPORT
Disclaimer
This Project Outcomes Report for the General Public is displayed verbatim as submitted by the Principal Investigator (PI) for this award. Any opinions, findings, and conclusions or recommendations expressed in this Report are those of the PI and do not necessarily reflect the views of the National Science Foundation; NSF has not approved or endorsed its content.
In July of 2019, a sereis of strong earthquakes, including a magnitude 7.1 mainshock, have occurred near the town of Ridgecrest in Eastern California. To measure surface deformation produced by the 2019 Ridgecrest earthquake sequence, as well as the expected post-seismic transient, we conducted a survey of geodetic monuments located within 50 km from the earthquake rupture. The survey was part of a coordinated multi-instritution response to seismic activity near Ridgecrest. Teams from the Scripps Institution of Oceanography/University of California San Diego we deployed Global Navigational Satellite System (GNSS) instruments to measure precise positions of 7 geodetic monuments in the south-west quadrant of the earthquake rupture. The earliest post-earthquake GNSS data were collected within 2 days after the mainshock. The data provided valuable constraints on coseismic slip models, and allowed us to investigate stress interactions and possible triggering relationships between the foreshock and the mainshock. We left the instruments recording in a semi-permanent mode for one year following the earthquake to capture the early phase of slow aseismic relaxation. The data were collected, pre-processed, and archived for public access at UNAVCO. Time series of post-seismic displacements derived from the collected data will provide valuable constraints on the mechanisms of postseismic relaxation. The project has provided training and field experience for two graduate students.
Last Modified: 08/06/2020
Modified by: Yuri Fialko
Please report errors in award information by writing to: awardsearch@nsf.gov.
