4. Declustered earthquake catalog without duplicates for the western U.S.

In processing step 3, declustering is applied to flag aftershocks and foreshocks in catalog wmm.c2. Each earthquake is considered a potential mainshock, and an algorithm searches for events within a specified distance from its epicenter and time after its origin (Gardner and Knopoff, 1974). A smaller earthquake found within a window is an aftershock. If a larger earthquake is found, the first earthquake is a foreshock of the larger one. WUS catalog wmm.c3 is produced by deleting aftershocks and foreshocks from wmm.c2; it consists of statistically independent earthquakes with moment magnitudes greater than or equal to 2.5.

1b. Master earthquake catalog for the western U.S., for use outside the UCERF3 zone (Catalog B)

In processing step 1, preexisting catalogs found online or in the literature are collected and merged. Each entry is reformatted to a standard record that lists basic earthquake information (moment magnitude, hypocenter, origin time), three parameters for modeling seismicity rates, and a comment field that lists the original catalog and size measure. Two distinct WUS catalogs are produced in step 1 to facilitate integrating California seismicity with the rest of the WUS. The Uniform California Earthquake Rupture Forecast (UCERF3) project developed a catalog for a region extending about 100km beyond the California border. Catalog B is constructed for the whole WUS with the intention of using only its part outside...

2b. Earthquake catalog without duplicates for the western U.S., for use outside the UCERF3 zone (Catalog B)

In processing step 2, duplicate entries, explosions, and mining-related seismic events are deleted from wmm_wg.c1 and wmm_rw.c1. Duplicates are identified within time and distance windows, and a preference hierarchy is used to select a favorite. Non-tectonic catalogs in the literature and online event-by-type catalog searches are used to identify explosions and mining-related events. Two distinct WUS catalogs are produced in step 2 to facilitate integrating California seismicity with the rest of the WUS. The Uniform California Earthquake Rupture Forecast (UCERF3) project developed a catalog for a region extending about 100km beyond the California border. Catalog B is constructed for the whole western U.S. with...

3. Merged earthquake catalog without duplicates for the western U.S. (Catalog A inside UCERF3 zone and Catalog B outside UCERF3 zone)

The two duplicate-free WUS catalogs wmm_wg.c2 (Catalog A) and wmm_rw.c2 (Catalog B) are merged by retaining those events from Catalog A that are inside the UCERF3 zone and those events from Catalog B that are outside the UCERF3 zone.

Boundary of UCERF3 zone

The Uniform California Earthquake Rupture Forecast (UCERF3) project developed an earthquake catalog for a region extending about 100km beyond the California border. The boundary is used in several of the steps when processing the earthquake catalogs for the western U.S. This data set contains the vertices of that boundary.

2a. Earthquake catalog without duplicates for the western U.S., for use inside the UCERF3 zone (Catalog A)

In processing step 2, duplicate entries, explosions, and mining-related seismic events are deleted from wmm_wg.c1 and wmm_rw.c1. Duplicates are identified within time and distance windows, and a preference hierarchy is used to select a favorite. Non-tectonic catalogs in the literature and online event-by-type catalog searches are used to identify explosions and mining-related events. Two distinct WUS catalogs are produced in step 2 to facilitate integrating California seismicity with the rest of the WUS. The Uniform California Earthquake Rupture Forecast (UCERF3) project developed a catalog for a region extending about 100km beyond the California border. Catalog A is constructed for the whole western U.S. with...

1a. Master earthquake catalog for the western U.S., for use inside the UCERF3 zone (Catalog A)

In processing step 1, preexisting catalogs found online or in the literature are collected and merged. Each entry is reformatted to a standard record that lists basic earthquake information (moment magnitude, hypocenter, origin time), three parameters for modeling seismicity rates, and a comment field that lists the original catalog and size measure. Two distinct WUS catalogs are produced in step 1 to facilitate integrating California seismicity with the rest of the WUS. The Uniform California Earthquake Rupture Forecast (UCERF3) project developed a catalog for a region extending about 100km beyond the California border. Catalog A is constructed for the whole western U.S. with the intention of using only its part...