Images

USGS Seismologists Alan Yong and Elizabeth Cohcran conduct field work near the main rupture between Trona and Ridgecrest California.

Fault scarp close to the epicenter. In this location the fault has a main strand where much of the slip occurred, as well as distributed fractures.

Measurement of fault offset being done by USGS scientist Ken Hudnut, using the offset of a painted road stripe. This measurement was conducted following the Magnitude 6.4 earthquake that struck Searles Valley on July 4, 2019.

Measuring a fault offset on California State Route 178. This measurement was conducted following the Magnitude 6.4 earthquake that struck Searles Valley on July 4, 2019.

A fault offset on California State Route 178 with a pen for scale. This measurement was conducted following the Magnitude 6.4 earthquake that struck Searles Valley on July 4, 2019.

On July 4, 2019, a Magnitude 6.4 earthquake struck Searles Valley, CA. This photo provides likely evidence that the fault that hosted the earthquake ruptured to the ground surface.

On July 4, 2019, a Magnitude 6.4 earthquake struck Searles Valley, CA. This photo provides likely evidence that the fault that hosted the earthquake ruptured to the ground surface.

A fault offset on California State Route 178 following the Magnitude 6.4 earthquake that struck Searles Valley on July 4, 2019.

Janis Hernandez (California Geological Survey) measures 18 centimeters of offset across one strand of the fault rupture zone. This measurement was conducted following the Magnitude 6.4 earthquake that struck Searles Valley on July 4, 2019.

Measurement of fault offset being done by USGS scientist Ken Hudnut, using the offset of a painted road stripe on California State Route 178. This measurement was conducted following the Magnitude 6.4 earthquake that struck Searles Valley on July 4, 2019.

California State Route 178, showing cracks due to fault offsets following the Magnitude 6.4 earthquake that struck Searles Valley on July 4, 2019.

Moletrack crossing China Lake dry lake bed after Ridgecrest earthquake in July of 2019.

Belle Philibosian working with Gordon Seitz (CGS) and Stephan Bock (NAWS) to document surface ruptures of the M7.1 Ridgecrest earthquake, July 2019.

House destroyed by Palu earthquake-induced liquefaction. Note standing water which indicates a nearly surface-level water table that contributed to the widespread liquefaction.

Figure 2: Zooming in to red rectangle A from figure 1. Points colored by laser intensity (blue = low intensity, red = high intensity).

A USGS electronics technician performs maintenance on a ShakeAlert Earthquake Early Warning (EEW) sensor station, located in the San Francisco Bay Area. ShakeAlert station components include strong-motion accelerometers, solar panel and battery power systems, and communications & telemetry equipment for communication with the wider ShakeAlert network. 

The nighttime Oakland city skyline as seen from San Francisco with the Bay Bridge in the foreground

USGS Research Oceanographer Lauren Toth and Oceanographer Anastasios Stathakopoulos study a coral-reef core in the USGS’s Core Archive in St. Petersburg, Florida. Photo: Dominique Gallery, USGS.

A reef in the Florida Keys National Marine Sanctuary with little living coral and extensive bioerosion. Photo taken under research permit number FKNMS-2016-085-A1. Credit: USGS, Ilsa Kuffner.

The nighttime Oakland city skyline as seen from San Francisco with the Bay Bridge in the foreground

A modern coral reef in Dry Tortugas National Park. There is little living coral and high rates of bioerosion. Photo taken under research permit number DRTO-2018-SCI-0005. Credit: Lauren Toth, USGS