#WALNUT CALIFORNIA EARTH QUAKE HOW TO#

The recent hazard update includes: (1) an updated catalog of past and recent earthquakes, (2) new ground-shaking models in the central and eastern U.S. Here, research geologist Belle Philibosian was part of a USGS field team working with Gordon Seitz (CGS) and Stephan Bock (NAWS) in the Ridgecrest area on the NAWS documenting fault offsets through direct measurements using tools ranging from tape measures to mobile laser scanning.

The earthquakes were large enough that the fault rupture reached the earth’s surface. Geologists with USGS, the California Geological Survey (CGS) and Naval Air Weapons Station China Lake (NAWS) worked together in response to the Ridgecrest earthquake sequence in California that occurred July 4-6, 2019. For example, the 2019 Ridgecrest earthquakes (M 6.4 and M 7.1) showed that surface ruptures can be very complex (Figure 1) and can cause complicated ground shaking that should be accounted for in updated models.

#WALNUT CALIFORNIA EARTH QUAKE HOW TO#

As new earthquakes occur, the National Seismic Hazard Model Project Team considers how to incorporate those scientific observations into improved hazard models across the country. (Alaska, Arizona, California, Colorado, Delaware, Hawaii, Idaho, Kansas, Michigan, Montana, Nebraska, Nevada, New Mexico, Oklahoma, Oregon, South Carolina, Tennessee, Texas, Utah, Washington, and Wyoming). Earthquake hazards are an important consideration in planning efforts across the U.S., and during the past 6 years strongly felt earthquakes (>M 4) occurred in 21 states in the U.S.

Research from government, academia, and industry is used to produce such models, which consider where future earthquakes might occur, how often the earthquakes happen, how big the earthquakes might be, and how strongly the ground could shake.

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