Preliminary report on engineering and geological effects of the July 2019 Ridgecrest earthquake sequence
Naval Air Weapons Station, China Lake; City of Ridgecrest Police; GEER, EERI, SCEC, UCLA, USC, UNR and many others
By: Scott J Brandenberg, Pengfei Wang, Chukwuebuka C Nweke, Kenneth Hudson, Silvia Mazzoni, Yousef Bozorgnia, Kenneth W. Hudnut, Craig A. Davis, Sean K Ahdi, Farzin Zareian, Jawad Fayaz, Richard D Koehler, Colin Chupik, Ian Pierce, Alana Williams, Sinan Akciz, Martin B Hudson, Tadahiro Kishida, Benjamin A. Brooks, Ryan D. Gold, Daniel J. Ponti, Katherine M. Scharer, Devin McPhillips, Christopher DuRoss, Todd Ericksen, Janis Hernandez, Jay Patton, Brian Olson, Timothy E. Dawson, Jerome Treiman, Kelly Blake, Jeffrey Buchhuber, Chris L M Madugo, Joseph Sun, Andrea Donnellan, Greg Lyzenga, and Erik Conway
Edited by: Jonathan P. Stewart
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Abstract
The Ridgecrest Earthquake sequence included a foreshock event on July 4 2019 (M6.4) and a M7.1 mainshock event on July 5 2019. These events occurred in the Eastern California Shear Zone, near Indian Wells Valley, south of China Lake and west of Searles Valley. GEER has partnered with several organizations to collect perishable data and document the important impacts of these events, including the US Geological Survey, the California Geological Survey, the US Navy, the Southern California Earthquake Center, and local utilities. Critical geotechnical features of this event are extensive left-lateral (M6.4 event) and right-lateral (M7.1 event) surface ruptures over fault segments of variable complexity and width as well as across extensional and compressive step-over zones. We also document lifeline performance at fault crossings (gas, water, electrical), mainshock slip and afterslip, liquefaction and lateral spreading features, and liquefaction effects on structures. These effects are documented using field (ground) mapping and aerial imagery that will support subsequent development of high-resolution digital elevation models. Over 750 ground motions were recorded from the foreshock and mainshock alone, with many additional aftershock records. The data demonstrate significant impacts of site response and rupture directivity on ground motion attributes.
Suggested Citation
Brandenberg, S.J., Wang, P., Nweke, C.C., Hudson, K., Mazzoni, S., Bozorgnia, Y., Hudnut, K.W., Davis, C.A., Ahdi, S.K., Zareian, F., Fayaz, J., Koehler, R.D., Chupik, C., Pierce, I., Williams, A., Akciz, S., Hudson, M.B., Kishida, T., Brooks, B.A., Gold, R.D., Ponti, D.J., Scharer, K., McPhillips, D., DuRoss, C., Ericksen, T., Hernandez, J., Patton, J., Olson, B., Dawson, T.E., Treiman, J., Blake, K., Buchhuber, J., Madugo, C.L., Sun, J., Donnellan, A., Lyzenga, G., Conway, E., 2019, Preliminary report on engineering and geological effects of the July 2019 Ridgecrest earthquake sequence, 69 p., https://doi.org/10.18118/G6H66K.
| Publication type | Report |
|---|---|
| Publication Subtype | Other Government Series |
| Title | Preliminary report on engineering and geological effects of the July 2019 Ridgecrest earthquake sequence |
| DOI | 10.18118/G6H66K |
| Year Published | 2019 |
| Language | English |
| Publisher | Geotechnical Extreme Event Reconnaissance Association |
| Contributing office(s) | Earthquake Science Center |
| Description | 69 p. |
| First page | 1 |
| Last page | 69 |