Ridgecrest, CA 2009-2019 microseismicity catalog

Catalog of microseismicity between 2009-01-01 and 2019-07-04 in the Ridgecrest, California area (latitudes: 35.50 -- 36.00, longitudes: -117.80 -- -117.30). This catalog captures 10 years of seismic activity before the July 2019 Ridgecrest sequence, which started with a M6.4 on 2019-07-04 and was followed by a M7.1 on 2019-07-06.

v1.0.0: Earthquake catalog from "Enhanced Tidal Sensitivity of Seismicity Before the 2019 Magnitude 7.1 Ridgecrest, California Earthquake" (in press at Geophysical Research Letters). The catalog contains 191,569 events and was built with the BPMF workflow (v2.0.0alpha, https://github.com/ebeauce/Seismic_BPMF). v1.0.0 is available at https://doi.org/10.5281/zenodo.8127880.

v2.0.0: Minorly updated catalog accompanying "BPMF: A BackProjection and Matched-Filtering Workflow for Automated Earthquake Detection and Location" (submitted to Seismological Research Letters). The catalog contains 183,269 events, slightly revised locations and magnitudes with respect to v1, and was built with the BPMF workflow (v2.0.0beta, https://github.com/ebeauce/Seismic_BPMF).

v2.0.1: Removal of some regional (particularly at the edges of the study region) and teleseismic events and slightly updated event magnitudes. 155,794 events.

The catalog is a table with 11 columns:

event_id: a unique event identifier,

origin_time: origin time, UTC, of the event,

longitude: longitude in decimal system,

latitude: latitude in decimal system,

depth: depth in km,

hmax_unc: maximum horizontal uncertainty in km (from uncertainty covariance ellipsoid),

hmin_unc: minimum horizontal uncertainty in km (from uncertainty covariance ellipsoid),

az_hmax_unc: azimuth (angle from north) of maximum horizontal uncertainty in degrees,

vmax_unc: maximum vertical horizontal uncertainty in km (from uncertainty covariance ellipsoid),

Mw: moment magnitude, !! this column is mostly empty since most events were not well enough recorded to estimate a moment magnitude !!

Ml: local magnitude.