Mueller, Charles S. 2018 fixed format text file Text files and supporting metadata can be downloaded from: https://doi.org/10.5066/F7P26X4R https://doi.org/10.5066/F7P26X4R Mueller, Charles S. 2018 publication Seismological Research Letters Volume XX, Number YY, ZZ p. Albany, CA Seismological Society of America https://doi.org/10.1785/0220170108 A methodology has been developed at the U.S. Geological Survey (USGS) for making earthquake catalogs for seismic hazard analysis. A new catalog is assembled from several preexisting catalogs. Uniform moment magnitudes and related parameters for estimating unbiased seismicity rates are calculated. Duplicates, explosions, mining-related earthquakes, and induced earthquakes are flagged, and the catalog is declustered. Distinct catalogs are made for the central and eastern U.S. and the western U.S. This data set is the declustered catalog of induced earthquakes without duplicates for the central and eastern U.S. These data are a compilation of several earthquake source catalogs that are reformatted to a standardized record that lists basic information about each earthquake. This declustered catalog lists induced earthquakes without duplicates for the central and eastern U.S. 19620118 20161229 publication date Complete As needed -109.087 -80.543 41.931 27.708 none Seismic Earthquake Hazard Induced Natural USGS Metadata Identifier USGS:5ad775e1e4b0e2c2dd259ba9 http://geonames.usgs.gov/ Alabama Arkansas Colorado Florida Kansas Louisiana New Mexico Ohio Oklahoma Texas Utah USA United States None Acknowledgment of the U.S. Geological Survey, National Seismic Hazard Mapping Project would be appreciated in products derived from these data. Charles S. Mueller U.S. Geological Survey - Geologic Hazards Science Center mailing address

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Denver CO 80225 USA 303-273-8559 cmueller@usgs.gov Microsoft Windows 7 The following report provides detailed information on quality assessment for the data, as well as additional sub-catalogs derived from this master catalog: Mueller, C.S., 2018, Earthquake catalogs for the USGS National Seismic Hazard Maps: Seismological Research Letters, Volume XX, Number YY, ZZp., https://doi.org/10.1785/0220170108. Because this is a compilation of many source catalogs, duplicate events from differing source catalogs may exist. Data are complete. No features were generalized. All features are attributed. No features have been relocated from the original source catalog. A uniform earthquake catalog is assembled by combining and winnowing pre-existing source catalogs. Each source-catalog entry is reformatted to a standard record that lists basic information (magnitude, hypocenter, origin time), three parameters for computing seismicity rates, and a comment field. For most earthquakes, source catalogs do not list moment magnitude, Mw. Consistent rules are applied to estimate Mw from other size measures, and the original measure is listed in the comment field. For some well-recorded earthquakes, Mw is derived from analysis of seismic waveforms. For most CEUS earthquakes, Mw is converted from intensity, felt area, or instrumental magnitude. For a few remaining, mostly pre-instrumental events we estimate Mw. Computed seismicity rates may be biased if magnitudes: 1) follow an exponential distribution, and 2) are measured or estimated with uncertainty. For each earthquake we compute a uniform moment magnitude, Mwe (often, but not always, equal to Mw), and a counting factor, N*, that is a function of the magnitude uncertainty and the b value in the recurrence distribution. When earthquakes with Mwe greater than or equal to some mc are counted by N* (instead of unity), one gets the unbiased rate of mc+ earthquakes. Magnitude uncertainty is specified by sigma_m, the standard deviation of the magnitude error, taken from source catalogs or publications, or estimated based on the magnitude type and the era of the earthquake, taking into account greater uncertainties for older earthquakes. The catalog from this step lists all records from all source catalogs, including duplicates (from overlapping source catalogs), with a common format. All natural earthquakes and non-tectonic events are included. 2017 Duplicate entries, explosions, and mining-related seismic events are deleted from emm.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. The CEUS catalog produced in this step, emm.c2, lists natural earthquakes and induced earthquakes, without duplicates. 2017 Declustering is applied to flag aftershocks and foreshocks in catalog emm.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. CEUS catalog emm.c3 is produced by deleting aftershocks and foreshocks from emm.c2; it consists of statistically independent earthquakes with moment magnitudes greater than or equal to 2.5. 2017 Because of their transitory nature, induced earthquakes are excluded from seismic hazard models that are used for building codes, but they are used in special studies. Induced events are identified based on information in the literature, local expertise, and scrutiny of local catalogs. In this processing step, catalog emm.c3 is divided into two parts: a sub-catalog of suspected induced earthquakes ("pi"), and a complementary sub-catalog of natural earthquakes ("pn"). 2017 Vector Point 1196 0.0005 0.0005 Decimal Degrees D WGS 1984 WGS 1984 6378137.0 298.257223563 emm_pi.c3 Declustered catalog of induced earthquakes without duplicates for the central and eastern U.S. USGS The first line of the catalog is a header line listing all of the fields in the catalog Records for two earthquakes illustrate the catalog format: > 4.55 -65.630 49.440 15 1967 09 30 22 39 48. 0.240 4.55 1.165 NCE|mn,4.7 5.65 -77.930 37.940 6 2011 08 23 17 51 05. 0.100 5.63 1.027 SLU|wo,5.65 > 123456789012345678901234567890123456789012345678901234567890123456 > Field 1 lists Mw, fields 2 and 3 list longitude and latitude, and field 4 lists depth (km). Fields 5-10 list origin time (year, month, day, hour, minute, second; UTC). Fields 11-13 list sigma_m, Mwe, and N*. The comment field (of arbitrary length) begins in column 66. The Mw in field 1 is the most natural or widely accepted value (in our judgment), whereas Mwe for rate calculations is listed in field 12. For the 1967 earthquake, MNuttli ("mn,4.7") is converted to Mw = Mwe = 4.55. For the 2011 (Mineral, Virginia) earthquake, Mw = 5.65 is estimated from analysis of waveforms, and adjusted to Mwe = 5.63. Two characters after "|" in the comment field denote the type or treatment of the original size measure. Mueller, C.S., 2018, Earthquake Catalogs for the USGS National Seismic Hazard Maps: Seismological Research Letters, Volume X, Number Y, ZZ p., https://doi.org/10.1785/0220170108. U.S. Geological Survey - ScienceBase mailing address

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Lakewood CO 80215 USA 1-888-275-8747 sciencebase@usgs.gov Downloadable fixed format data file in ASCII text format. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this information product, for the most part, is in the public domain, it also contains copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner whenever applicable. The data have been approved for release and publication by the U.S. Geological Survey (USGS). Although the data have been subjected to rigorous review and are substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, the data are released on the condition that neither the USGS nor the U.S. Government may be held liable for any damages resulting from authorized or unauthorized use. Although the data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and/or contained herein. Users of the data are advised to read all metadata and associated documentation thoroughly to understand appropriate use and data limitations. fixed format text file 1.0 fixed format text file Declustered catalog of induced earthquakes without duplicates for the central and eastern U.S. Files may need to be decompressed using winzip or similar utility 0.3 https://doi.org/10.5066/F7P26X4R none 20260313 U.S. Geological Survey - Geologic Hazards Science Center Ken Rukstales mailing address

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Lakewood CO 80225 USA 303-273-8677 ghsc_metadata@usgs.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time