"~T 'T * * T Jrjustoricai1 i ~m ft iK^-S-VTi" *~+if~%- I y-s,- .O.W GEOLOGICTAI, SURVEY PROFESSmNAL f*APEm 1090 Historical Survey of U.S. Seismograph Stations By BARBARA B. POPPE GEOLOGICAL SURVEY PROFESSIONAL PAPER 1096 A listing of seismograph stations, including information on operating organizations, instrumentation, and availability of seismograms UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON 1979 UNITED STATES DEPARTMENT OF THE INTERIOR CECIL D. ANDRUS, Secretary GEOLOGICAL SURVEY H. William Menard, Director For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402 Stock Number 024-001 -03111 -6 CONTENTS Page Abstract ................................ 1 Introduction .............................. 1 Explanation of Station Listings. .................... 2 Acknowledgments............................. 3 References ............................... 3 Glossary of Abbreviations. ....................... 3 Station Listings by State Alabama. ............................... 5 Alaska ................................ 8 Arizona. ............................... 32 Arkansas ............................... 44 California .............................. 50 Colorado ............................... 101 Connecticut. ............................. 113 Delaware ............................... 117 District of Columbia ......................... 118 Florida. ............................... 121 Georgia. ............................... 123 Hawaii and the Pacific ........................ 126 Idaho. ................................ 135 Illinois ............................... 144 Indiana. ............................... 148 Iowa ................................. 150 Kansas ................................ 153 Kentucky ............................... 156 Louisiana. .............................. 160 Maine. ................................ 162 Maryland ............................... 166 Massachusetts. ............................ 168 Michigan ............................... 170 Minnesota. .............................. 172 Mississippi. ............................. 175 Missouri ............................... 178 Montana. ............................... 183 Nebraska ............................... 194 Nevada ................................ 196 New Hampshire. ............................ 211 New Jersey .............................. 215 New Mexico .............................. 217 New York ............................... 225 North Carolina ............................ 242 North Dakota ............................. 245 Ohio ................................. 246 Oklahoma ............................... 251 Oregon ................................ 257 Panama Canal Zone. .......................... 266 Pennsylvania ............................. 267 Puerto Rico. ............................. 277 Rhode Island ............................. 282 South Carolina ............................ 283 South Dakota ............................. 288 Tennessee. .............................. 292 Texas. ................................ 299 Utah ................................. 313 Vermont. ............................... 322 Virgin Islands ............................ 324 Virginia ............................... 325 Washington .............................. 333 West Virginia. ............................ 345 Wisconsin. .............................. 347 Wyoming. ............................... 351 APPENDIXES Appendix 1. Organizations operating in more than one state. ...... 361 2. Response curves ...................... 363 3. Alphabetic listing of station codes ............ 367 4. Regional maps of stations ................. 383 III HISTORICAL SURVEY OF U.S. SEISMOGRAPH STATIONS By Barbara B. Poppe ABSTRACT The data are presented alphabetically by state and then by the operating institution. In the upper right-hand corner of each page is the Although catalogs of seismograph stations State name and the city in which the operating have been compiled in the past, there has been organization is located. Pages are arranged no comprehensive modern record of the nearly alphabetically, first by in-State addresses and 1500 stations in the United States. This survey then by out-of-State addresses. Although most contains the vital information about the sta­ networks are confined to one State, those net­ tions: who runs them, where they are, what works that overlap more than one have been split instruments are used, and where the records are so that the address of the network operator is kept. For historical interest, information listed in each State with tho'se stations of the about closed stations that can no longer contri­ network that are in that State. A listing of bute records to the seismological community is the states in which each organization operates nevertheless included. This survey will be stations is included in Appendix 1. useful for detailed study only in the few years after its release, because the data are con­ Appendix 2 contains response curves for 11 stantly in flux. However, significant operators instrument systems that are broadly used. Each and stations do remain the same, and this infor­ curve is typical of a particular seismometer mation should make station research easier in response, plotted as period vs. relative magnif­ the next decades. ication. Each is normalized to T . Appendix 3 is a cross-reference of stations in alphabetic order, and includes station name, state, oper­ INTRODUCTION ating organization, and page reference. The stations coded by NEIS (National Earthquake Information Service) are plotted on region maps This publication is a compilation of de­ in Appendix 4. tailed information about seismograph stations in the United States, the trust territories, Pana­ A critical point of confusion might arise ma, and the Commonwealth of Puerto Rico current in the use of station codes. The NEIS maintains to June 1977. Its principal purpose is to a list of internationally recognized codes, provide information on availability of records. which must not be confused with codes that have Stations no longer offering data are included if local validity but conflict with the estab­ specifics about them were available; all infor­ lished, assigned codes. Therefore, all assigned mation that was available was included, even if codes are written with no parentheses. Any incomplete. Not listed are stations about which station that has never contributed data to the no information existed beyond a simple refer­ NEIS and has consequently never had a code ence. assigned by the NEIS has its local code listed within parentheses. Also in parentheses are The majority of the information contained codes of stations that have been properly regis­ in this catalog was obtained from questionnaires tered and reserved but have not yet submitted sent to each station operator. Much updating data to the NEIS. All codes in parentheses are and completing of these files was carried on by nonetheless included because they are valuable telephone. The U.S. Geological Survey and Coast to anyone wanting to obtain data from a particu­ and Geodetic Survey (NOAA) files that extend lar station or read published station reports. back to the 1930's were helpful in finding In some cases both an assigned code and one used information on older stations. References that by the operating organization exists. When this were of invaluable help are listed at the end of duplication occurs, both codes are listed, the this publication. second being in parentheses. 1 EXPLANATION OF STATION LISTINGS "Seismometer component" is most generally General information.--Every effort was made listed as Z for vertical, NS for horizontal in a to discern the individual or organization in­ north-south direction, and EW for horizontal in volved with each station. Stations and networks an east-west direction. Conventionally, first are listed under the operating organization, so motion is N and E on horizontal instruments, and that contact can be made directly with that thus, when written as NS and EW, the first organization for current information and answers letters imply a first-motion direction. When to any questions. The records generally are the reverse orientation is known, the component available from the station, except where the is listed as SN or WE. Unfortunately, the more data are transferred to a data center. The conventional listing cannot imply absolutely National Geophysical and Solar-Terrestrial Data that the convention for first motion is fol­ Center in Boulder, Colo., is equipped to respond lowed. No mention is made of polarity changes to data requests by supplying copies of the that have occurred during a station's operation. records kept on file; the originals usually Orientations other than these are listed with reside at the station. their compass orientation. If the only informa­ tion known is that there was a horizontal in­ The address and telephone number listed in strument, it is listed simply as horizontal. most cases refer to the operating organization's central location; sometimes this is the address "Seismometer T " is the free period of the of a station. The different offices of the USGS seismometer, listed in seconds. "Galvo Tg" is are treated as separate organizations because the period of the galvanometer. For instrument the responsibility is distinctly segregated. systems that do not use a galvanometer, the The Telex number is listed when applicable. filter characteristics are given, either in seconds or, where noted, in hertz (Hz). Site information.--"Code"