Room: Holiday Ballroom 1
Date: 4/17/2025
Session Time: 2:00 PM to 3:15 PM (local time)
Earthquake Shaking and the Geologic Record: Triggered Phenomena and Preserved Fragile Geologic Features
The geologic record includes evidence of strong shaking from earthquakes, including shaking intensity and timing, with their distribution sometimes allowing earthquake locations to be inferred. Evidence of strong shaking intensities can also be due to ruptures of blind faults, providing further evidence for areas with less understood seismic occurrence. Some geologic shaking evidence is unique, preserving the rarest and most intense earthquake shaking over millennial timescales, which until recently have largely gone undocumented by seismometers. The geologic record of shaking includes turbidites, landslides, paleo liquefaction, speleothems, and fault-plane slickenlines. In addition, preserved fragile geologic features provide negative evidence for maximum shaking intensities. In this session, we welcome presentations that: 1) use geologic features to identify past strong ground motions, and infer the timing of such motions; 2) characterize the distribution of past strong ground shaking and recognize seismogenic sources through regional evidence; 3) estimate the likely maximum strengths of past ground motions permitted by the presence of fragile geologic features; 4) develop methodologies to locate and constrain ages of geologic features indicative of past ground motions; and 5) directly relate past strong ground motions to seismic hazard assessments.
Conveners:
Paula Marques Figueiredo, Assistant Research Professor, North Carolina State University, NC, (paula_figueiredo@ncsu.edu)
Devin F. McPhillips, Research Geologist, U.S. Geological Survey, Earthquake Science Center, Pasadena, CA, (dmcphillips@usgs.gov)
Thomas L. Pratt, Research Geophysicist, Central and Eastern Region Coordinator Earthquake Hazards Program, U.S. Geological Survey, Reston, VA, (tpratt@usgs.gov)
Mark W. Stirling, Chair of Earthquake Science, Otago Earthquake Science Group, University of Otago, New Zealand, (mark.stirling@otago.ac.nz)
Oral Presentations
| Participant Role | Details | Start Time | Minutes | Action |
|---|---|---|---|---|
| Submission | Evaluating the New Zealand National Seismic Hazard Model 2022 with Fragile Geologic Features | 02:00 PM | 15 | View |
| Submission | Paleoseismic Records of the Dead Sea Reveals Climatic Modulation of Seismicity Along the Continental Transform Faults | 02:15 PM | 15 | View |
| Submission | Directivity Effect of the 1976 Guatemala Earthquake Observed in Lacustrine Turbidites | 02:30 PM | 15 | View |
| Submission | 3D Mapping and Dynamic Analysis of Precariously Balanced Rocks for Fragility Modeling | 02:45 PM | 15 | View |
| Submission | Rapid Assessment of Precariously Balanced Rocks Using UAVs and 3D Semantic Structure from Motion | 03:00 PM | 15 | View |
| Total: | 75 Minute(s) |
Earthquake Shaking and the Geologic Record: Triggered Phenomena and Preserved Fragile Geologic Features - I
Description