Earthquakes in the United States, April-June 1979
Total Page:16
File Type:pdf, Size:1020Kb
GEOLOGICAL SURVEY CIRCULAR 836-B Earthquakes in the United States, April-June 1979 Earthquakes in the United States, April-June 1979 By C. W. Stover, P. Hubiak, J. H. Minsch, and W. J. Person G E 0 L 0 G I CAL 5 U R V E Y CIRCULAR 8 3 6- B· 1980 United States Department of the Interior CECIL D. ANDRUS, Secretary Geological Survey H. William Menard, Director Free on application to Branch of Distribution, U.S. Geological Survey, 1200 South Eods Street,Arlington, VA 22202 CONTENTS Page Introduction................................................................. Bl Discussion of tables.~····················································~·· 4 Modified Mercalli Intensity Scale of 1931.................................... 5 Acknowledgments..... • • • • • . • • • • • • • • • • • . • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 34 References cited ••••••••••••••••.••••• -....................................... 34 ILLUSTRATIONS Page FIGURE 1. "Earthquake Report" form.......................................... B2 2. Map showing standard time zones of the conterminous United States. 5 3. Map showing standard time zones·of Alaska and Hawaii.............. 6 4. Map of earthquake epicenters in the conterminous United States for April-June 1979................................................... 7 5. Map of earthquake epicenters in Alaska for April-June 1979........ 8 6. Map of earthquake epicenters in Hawaii for April-June 1979........ 9 7. Isoseismal map for the central California earthquake of 28 April 1979.............................................................. 20 8. Isoseismal map for the central California earthquake of 8 May 1979 21 9. Isoseismal map for the southern California earthquake of 29 June 1979.............................................................. 24 10. Isoseismal map for the southern California earthquake of 30 June 1979 ..••••.•.••••.•••.•.•••.••••••••.•.•••••••.••••••••••••••••.••• 26 11. Isoseismal map for the southern ·Maine earthquake of 18 April 1979. 28 TABLES Page TABLE 1. Summary of U.S. earthquakes for April-June 1979: Alaska •••.•••••.•••••••••.••••••••••••.••..••••••••••••••••••• Bll Arkansas .•..•••.•••••••.••.•••.••••••••••.•••••••••••••••••••• 13 California •••••.•.•.•.•••••..•••••••••••••••••.••••••••••••••• 13 California--Off the coast ••••••• ~ ••••.•••••••.•••••••••.•••••• 15 Hawaii •..••••.••..•.•.•.••••.•••••.••.•••••••••••••.•••••.•••. 15 Idaho •••••.••...•...•••..••••••••••••.•••••.••••.••••••••••••• 15 Ma in e ••••••••••••.•••••••• • •• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 15 Missouri •.••••••••••••••.••••••••••••••••••••••••.•••••••••.•• 15 Montana ••••••••••••••••••••••••••••••••.••••••••.•••••••••••.. 16 Nebraska •••••••..••.•.••••.•.••••••••••••.•••..•••••.•.••••••• 16 Nevada •..•••••••.••••..•••.••..•••••••••••••••..- •••••••••••••• 16 New Hampshire •••.•••••••.•••••.•••••••••••••.••••••••••.•••••• 16 New York •.••.•..•....••.••.•.••••••••••..••.••••••••.••••••••• 16 Oklahoma •.••••••.•..••.•...•.••.••••••••••••••.•.••••••••••••• 16 Oregon--Off the coast •.•••••••••••••••••••••••••••••••••••.••• 16 Utah •••••••.••••••••••.•.•.•••.•••••.•...•••..•••••••••••••••• 16 Washington ••••.•.••••••••••••••.•••.••••.•••••••••••.••••••••• 16 Washington--Off the coast .•.•••••••••..•••••••••••.•••..•.•••.• 16 Ill Page 2. Summary of macroseismic data for u.s. earthquakes, April-June 1979: Alaska •••••••••••••••••••••••••••••••••••••••••••••••••••••••• Bl7 Arkansas •••••••••••••••••••••••••••••••••••••••••••••••••••••• 18 California •••••••••••••••••••••••••••••••••••••••••••••••••••• 19 Hawaii •••••••••••••••••••••••••••••••••••••••••••••••••••••••• 25 Idaho ••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 27 Kansas •••••••••••••••••••••••••••••••••••••••••••••••••••••••• 27 Maine •••••••••••••••••••••••••••••••••••••• • • • • • • • • • • • • • • • • • • • 27 Massachusetts ••••••••••••••••••••••••••••••••••••••••••••••••• 31 Missouri •••••••••••••••••••••••••••••••••••••• "" ••••••••••• 31 Montana ••••••••••••• "•••••••••••••••••••••••••••••••••••••• 31 Nebraska ••••••••••" ••••••• •' •••••••••••••••••••••••••••••••• 32 Nevada •••••••••••••••••••••••••••••••••••••••••••••••••••••••• 32 "New Hampshire ••••••••••••••••••••••••••••••••••••••••••••••••• 33 Oklahoma •••••••••••••••••••••••••••••••••••••••••••••••••••••• 33 Oregon •••••••••••••••••••••••••••••••••••••••••••••••••••••••• 33 Tennessee ••••••••••••••••••••••••••••••••••••••••••••••••••••• 33 Utah •••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 33 Washington •••••••••••••••••••••••••••••••••••••••••••••••••••• 33 Wyo~ ing ••••••••••••••.••••••••••••••••• • • • • • • • • • • • • • • • • • • • • • • • • 33 IV Earthquakes in the United States, April-June 1979 By C. W. Stover, P. Hubiak, J. H. Minsch, and W. v. Person INTRODUCTION The intensities and macroseismic data were compiled from information The earthquake information in this obtained through questionnaires, from publication supplements that published newspaper articles, and with the in the NEIS (National Earthquake cooperation of other Government Information Service) publications, agencies, State institutions, local PDE ("Preliminary Determination of Epi organizations, and individuals. (See centers") and "Preliminary Determina "Acknowledgments" for a list of collab tion of Epicenters, Monthly Listing," orators.) Figure 1 is the questionnaire to the extent of providing detailed in current use by the NEIS. Other ver felt and intensity data, as well as sions of this questionnaire are used by iso$eismal maps for u.s. earthquakes. State agencies, engineering firms, and The purpose is to provide a complete other Government agencies to collect listing of macroseismic effects of intensity data. Anyone wishing to sub earthquakes, which can be used in risk mit felt or damage information on earth studies, nuclear power plant site quakes for inclusion in future reports evaluations, seismicity studies, and should send it to the National answering inquiries by the public. Earthquake Information Servic~, Stop 967, Box 25046, Denver Federal This publication contains two major Center, Denver, CO 80225. Copies sections. The first (table 1) is a of the current "Earthquake Report" ques tabular listing of earthquakes in tionnaire can be obtained at this chronological order by State, con address. sisting of the following basic information: date, origin time, hypo The primary method used by the NElS center, magnitude, max,imum intensity, to collect macroseismic information is a and computational source of the questionnaire canvass using the hypocenter. The second section consists "Earthquake Report" forms, which are of five maps and table 2, which lists mailed to postmasters in the area detailed intensity information. The affected by the earthquake. The list of earthquakes in table 1 was postmasters complete the forms and compiled from those located in return them to the NEIS, where they Alaska or off the coasts that were are evaluated and an intensity published in the PDE; from hypocenters value is assigned. The intensity located in the conterminous United observations are mapped and con- States using the u.s. Geological Survey toured by isoseismals. Isoseismal program SEDAS; from hypocenters in contours present a generalization Califor~ia above magnitude 3.0, supplied of intensity data and an extra by California Institute of Technology, polation of these data to regions from Pasadena, the University of Califor which there are no observations; nia, Berkeley, and other offices of the they do not necessarily account u.s. Geological Survey; from hypo for every individual observation. centers in Hawaii supplied by the Hawaiian Volcano Observatory; and from The data in table 2 will be any others that were felt or that included in the "Earthquake Descrip caused damage, regardless of magnitude tion" section of "United States Earth or availability of a hypocenter. Known quakes," an annual publication, to or suspected explosions are also which later data from other sources may listed. be added for the purpose of updating Bl U.S. DEPARTMENT OF THE INTERIOR Form Approved GEOLOGICAL SURVEY EARTHQUAKE REPORT OMB No. 42-R1700 Please answer this questionnaire and return as soon as possible 1. Was an earthquake felt by anyone in your town near the date and time indicated on the opposite page? No: Please refold and tape for return mail. Yes: Date Time AM Standard time PM Daylight time Name of person filling out form Address City County State Zip code If you felt the earthquake, complete the following section. If others felt the earthquake but you did not, skip the personal report and complete the community report. PERSONAL REPORT 2a. Did you personally feel the earthquake? Yes No b. Were you awakened by the earthquake? Yes No c. Were you frightened by the earthquake? Yes No d. Were you at 4 Home 5 Work Other? e. Town and zip code of your location at time of earthquake f. Check your activity when the earthquake occurred: 7 Walking 8 Sleeping Lying down 10 Standing 11 Driving (car in motion) 12 Sitting 13 Other g. Were you 14 Inside or 15 Outside? h. If inside, on what floor were you? 16 i. Vibration could be described as 17 Light 18 Heavy j. Was there earth noise? No 19 Faint 20 Moderate 21 Loud k. Direction of noise North South East West 1. Estimated duration of 22 Sudden, sharp (less than 10 sees) 23 Long (30-60 sees) shaking 24 Short ( 10.:.30 sees) Continue on to next section which should include personal as well as reported