Earthquake Engineering Research Institute
Learning From Earthquakes

EERI Earthquake Reconnaissance Report: 2019 Ridgecrest Earthquake Sequence

July 29, 2020

July 2020, Earthquake Engineering Research Institute.

As a managing partner of the California Earthquake Clearinghouse, EERI, along with the California Geological Survey, operated a physical clearinghouse location in Ridgecrest, CA following the M6.4 earthquake on July 4, 2019. Over the course of the weeklong activation, the scientific and engineering communities came together in clearinghouse briefing calls to coordinate, collaborate, and share information. The Ridgecrest Earthquake Sequence Reconnaissance Report is a product of this community effort to document impacts and share lessons.

The report captures reconnaissance findings from the first months following the main shock and includes sections from over 30 contributors. The multi-disciplinary report includes sections on geosciences, geotechnical impacts, lifelines, structural impacts, emergency response, clearinghouse operations, and data collection methods and products. The report features a close look at the extent of damage to manufactured homes, which emphasized the vulnerability of these structures, given the limited occurrence of damage to structures overall in the City of Ridgecrest. The report also includes several sections on data collection methods and products that show progress in collecting and coordinating post-earthquake data.

Read the Report: EERI Earthquake Reconnaissance Report: 2019 Ridgecrest Earthquake Sequence