Utah Earthquake Epicenters 1850 to 2016

The tectonic earthquake data are primarily from a Uniform Moment Magnitude Earthquake Catalog developed for Utah and its surrounding region by Arabasz and others (2016) for the time period 1850 through September 2012. For the map, we extended the catalog through December 2016 and expanded it to include earthquakes smaller than magnitude 2.9. MIS was excluded from the compilation of Arabasz and others (2016) but has been added to the map to show its significance in east-central Utah. Data for the seismic events plotted on the map are listed in two separate catalogs in the form of an ArcGIS feature class within a file geodatabase. The catalog files are available in the Utah Geospatial Resource Center (UGRC) State Geographic Information Database (SGID, https://gis.utah.gov/data/geoscience/) and at https://ugspub.nr.utah.gov/publications/open_file_reports/ofr-667/ofr-667.zip. The primary catalog used for the map, termed the Earthquake Catalog (EQ Catalog, Utah_EQcat_1850_2016), comprises tectonic earthquakes located within the “Utah Region” (lat. 36.75° to 42.50° N, long. 108.75° to 114.25° W) from 1850 through 2016. This region is the standard region used by the University of Utah Seismograph Stations (UUSS) for the compilation and reporting of earthquakes within and surrounding Utah. Note that the map covers most, but not all, of the Utah Region. The map delineates two areas in east-central Utah that are characterized by predominantly (more than 90%) MIS. All seismic events (including both MIS and tectonic earthquakes) located in these two areas are listed in a separate catalog, termed the Coal-Mining-Region Catalog (CMR Catalog)(Utah_CMRcat_1928_2016), which extends from 1928 (the year of the first located event) through 2016. The EQ and CMR catalogs are mutually exclusive. The EQ Catalog does not include tectonic earthquakes located within the two delineated areas of predominantly MIS. More information about the earthquake epicenter data is contained in UGS OFR 667 (https://ugspub.nr.utah.gov/publications/open_file_reports/ofr-667/ofr-667.pdf).构造地震数据主要源自Arabasz等人2016年为犹他州及周边区域构建的统一矩震级地震目录（Uniform Moment Magnitude Earthquake Catalog），时间跨度为1850年至2012年9月。为制作本次地图，我们将该目录扩展至2016年12月，并补充了震级小于2.9的地震事件。 采矿诱发地震（Mining-induced Seismicity, MIS）在Arabasz等人2016年的原始编目中未被纳入，但本次地图补充了该类事件，以展示其在犹他州中东部区域的重要性。 本次地图所标注的地震事件数据，以文件地理数据库（file geodatabase）中的ArcGIS要素类（ArcGIS feature class）形式存储于两个独立目录中。该目录文件可从犹他州地理资源中心（Utah Geospatial Resource Center, UGRC）的州地理信息数据库（State Geographic Information Database, SGID，https://gis.utah.gov/data/geoscience/）以及https://ugspub.nr.utah.gov/publications/open_file_reports/ofr-667/ofr-667.zip获取。 本次地图使用的主目录命名为地震目录（Earthquake Catalog, EQ Catalog, Utah_EQcat_1850_2016），涵盖1850年至2016年间位于“犹他区域”（北纬36.75°至42.50°，西经108.75°至114.25°）内的构造地震。该区域是犹他大学地震台站（University of Utah Seismograph Stations, UUSS）用于编目和报告犹他州及周边区域地震的标准研究区域。请注意，本次地图仅覆盖犹他区域的大部分区域，而非全部范围。 地图标注了犹他州中东部的两个区域，这两个区域以占比超过90%的MIS事件为主要特征。位于这两个区域内的所有地震事件（包括MIS和构造地震）均收录于另一个独立目录，命名为煤矿区目录（Coal-Mining-Region Catalog, CMR Catalog, Utah_CMRcat_1928_2016），时间跨度为1928年（首个可定位地震事件的年份）至2016年。 EQ目录与CMR目录互斥，EQ目录未纳入上述两个以MIS为主的标注区域内的构造地震事件。更多关于地震震中数据的详细信息可参阅犹他地质调查局公开报告667（Utah Geological Survey Open File Report 667, UGS OFR 667，https://ugspub.nr.utah.gov/publications/open_file_reports/ofr-667/ofr-667.pdf）。