Earthquake Catalogs from temporary seismic deployments in southwestern Utah, June 2016-October 2017 (CSV).
This earthquake catalog was compiled for research of seismicity in the Sevier Thermal area in southwestern Utah. Three-Component 5 Hz Nodal geophones were deployed in 30-day experiments to record seismicity below detection levels of the regional network. Detection was performed on continuous seismic data using a traditional STA/LTA detector and a frequency domain detector. In total 203 event were detected and are listed in this catalog. The catalog begins June 29th, 2016 and ends October 9th, 2017 but is not continuous throughout this time period as Nodal arrays were deployed at discrete intervals during the entire monitoring effort.
Information in the catalog represents event locations following the HYPOINVERSE2000 output. A CSV file is attached that contains event information. Headers are provided and outlined below.
|Array||Nodal Array code, Crater Knoll (CK), FORGE (FG1, FG2 reoccupied dense grid), Twin Peaks (TP), Dog Valley (DV)|
|YRMODAY||Origin date, YYMMDD format.|
|HRMIN||Origin time, HHMM|
|SEC||Origin time, seconds.|
|LAT||Origin latitude in decimal degrees.|
|LON||Origin longitude in decimal degrees|
|Depth||Origin depth in kilometers|
|Detector||Detector designed in study to detect microseismicity that detected event|
|Nphases||Number of P-wave arrival times picked for event.|
|Azimuthal Gap||Maximum azimuthal gap between stations with arrival picks.|
|Distance to Nearest Station||Distances to closest station with an arrival pick.|
|RMS||Root-mean-squared error of the residuals (seconds)|
|ERH||Horizontal error, 95% confidence ellipse in horizontal plane.|
|ERZ||Horizontal error, 95% confidence ellipse in vertical plane.|
|Event Quality||Letter Grade assigned by HYPO2000.|
Trow, A, H. Zhang, A. S. Record, K. A. Mendoza, K. L. Pankow, P. E. Wannamaker (in review). Microseismic Event Detection using Multiple Large-N Geophone Arrays in Southwestern Utah. Seismological Research Letters: Seismological Society of America. In Review.
Klein, F. W. (2002), User’s guide to HYPOINVERSE2000, a Fortran program to solve for earthquake locations and magnitudes, U.S. Geol. Surv. Open-File Rep., 02-172, 123 pp., 01-113, Menlo Park, California.