Seismology, Tectonics and Earth's Interior Seminar - spring-2021


Liquefaction Susceptibility and Triggering of Fine-Grained soils and related ground failure during the 2019 Ridgecrest Earthquake Sequence and the Next Generation Liquefaction Project

March 31, 2021
noon - 1 p.m.
zoom

Presented By:

  • Kenneth Hudson - UCLA Department of Civil and Environmental Engineering
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The 2019 Ridgecrest earthquake sequence produced a 4 July M 6.5 foreshock and a 5 July M 7.1 mainshock, along with 23 events with magnitudes greater than 4.5 in the 24 hr period following the mainshock. The epicenters of the two principal events were located in the Indian Wells Valley, northwest of Searles Valley near the towns of Ridgecrest, Trona, and Argus. I describe observed liquefaction manifestations including sand boils, fissures, and lateral spreading features, as well as proximate non-ground failure zones that resulted from the sequence. Expanding upon results initially presented in a report of the Geotechnical Extreme Events Reconnaissance Association, we synthesize results of field mapping, aerial imagery, and inferences of ground deformations from Synthetic Aperture Radar-based damage proxy maps (DPMs). We document incidents of liquefaction, settlement, and lateral spreading in the Naval Air Weapons Station China Lake US military base and compare locations of these observations to pre- and postevent mapping of liquefaction hazards. We describe liquefaction and ground-failure features in Trona and Argus, which produced lateral deformations and impacts on several single-story masonry and wood frame buildings. Detailed maps showing zones with and without ground failure are provided for these towns, along with mapped ground deformations along transects. Finally, I describe incidents of massive liquefaction with related ground failures and proximate areas of similar geologic origin without ground failure in the Searles Lakebed. Observations in this region are consistent with surface change predicted by the DPM. In the same region, geospatial liquefaction hazard maps are effective at identifying broad percentages of land with liquefaction-related damage. I anticipate that data presented in this talk will be useful for future liquefaction susceptibility, triggering, and consequence studies being undertaken as part of the Next Generation Liquefaction project.


Climatic controls on millennial erosion rates in the eastern end of Himalaya (Kevin Shao) + Examining erosion and landscape response to tectonics within the San Bernardino Mountains, California (Marina Argueta)

April 7, 2021
noon - 1 p.m.
Zoom

Presented By:

  • Marina Argueta - UCLA EPSS
  • Kevin Shao - UCLA EPSS
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Seminar Description coming soon.

Planetary Seismology: Key results from the prime mission of InSight and prospects for Dragonfly

April 14, 2021
noon - 1 p.m.
zoom

Presented By:

  • Mark Panning - JPL
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Seminar Description coming soon.

Preparing for Icy Ocean World Seismology: Modeling and Field Methods

April 28, 2021
noon - 1 p.m.
zoom

Presented By:

  • Angela Marusiak - JPL
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TBD - Alxander Neely

May 5, 2021
noon - 1 p.m.
zoom

Presented By:

  • Alxander Neely - UCLA EPSS
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TBD - Julien Chaput

May 12, 2021
noon - 1 p.m.
zoom

Presented By:

  • Julien Chaput - UTEP
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TBD - Quancheng Huang

May 19, 2021
noon - 1 p.m.
zoom

Presented By:

  • Quancheng Huang - New Mexico State University
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TBD - Valeria Jaramillo

May 26, 2021
noon - 1 p.m.
zoom

Presented By:

  • Valeria Jaramillo - UCLA EPSS
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TBD - Jacqueline Austermann

June 2, 2021
noon - 1 p.m.
zoom

Presented By:

  • Jacqueline Austermann - Lamont
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