Seismic waves with frequencies from 1 to 100 cycles per second recorded in a deep mine in Northern New Jersey

A vertical component seismograph with a magnification of about 8 million at 20 cps was operated cps was operated 1780 feet below the surface at the Sterling mine of the New Jersey Zinc Company in Ogdensburg, New Jersey. Background noise, local earthquakes and teleseismic body phases were recorded. For frequencies greater than 2 cps, the continuous part of the background noise was fairly stationary during nighttime recording intervals and at a level lower than that at all but 9 of the 54 sites surveyed by Frantti (1963). During 730 hours of recording at quiet background noise levels, 8 local earthquakes were detected. Six local shocks were recorded during an additional 2160 hours by conventional short period instrumentation located at Ogdensburg and Sterling Forest, New York. These data, combined with historical data on the occurrence of 22 larger shocks local to the area, are consistent with a linear relation between the logarithm of earthquake number and magnitude. This relation is given by log N = 2.6−0.9M, where N is the annual number of earthquakes which occur within 300 km of Ogdensburg and which have magnitudes greater than or equal to M . On this basis the seismicity of the area, which lies within a region of Paleozoic and early Mesozoic diastrophism, is about 2 orders of magnitude less than that of Southern California, 3 orders of magnitude less than that of the Garm region in Central Asia, and 4 orders of magnitude less than that of the Kwanto region in Japan. Phases from 18 distant earthquakes were recorded by the high gain instrument. Only P and S phases from West Indies shocks, 20 degrees distant, exhibited motion with frequencies greater than 3 cps.

[1]  J. Oliver,et al.  On elastic strain of the earth in the period range 5 seconds to 100 hours , 1964 .

[2]  J. Heirtzler,et al.  Magnetic Anomalies off Eastern North America , 1963 .

[3]  G. E. Frantti.  The nature of high-frequency Earth noise spectra , 1963 .

[4]  S. Alexander,et al.  IDENTIFICATION AND ELIMINATION OF MICROSEISM NOISE AT DEPTH USING THEORETICAL RAYLEIGH WAVE AND OBSERVED NOISE DISPLACEMENT. , 1963 .

[5]  METHODS FOR A DETAILED STUDY OF SEISMICITY , 1963 .

[6]  D. H. Shurbet.  The high frequency P and S phases from the West Indies , 1962 .

[7]  C. R. Holmes,et al.  Microearthquakes near Socorro, New Mexico , 1962 .

[8]  D. R. V. Sandt.  DETECTION OF DISTANT EXPLOSIONS BY SEISMIC MEASUREMENTS IN DEEP BOREHOLES , 1962 .

[9]  T. Utsu.  On the nature of three Alaskan aftershock sequences of 1957 and 1958 , 1962 .

[10]  W. E. Smith,et al.  Earthquakes of eastern Canada and adjacent areas, 1534-1927 , 1962 .

[11]  A. J. Eardley.  Structural Geology of North America , 1962 .

[12]  S. Miyamura.  Magnitude-Frequency Relation of Earthquakes and its Bearing on Geotectonics , 1962 .

[13]  T. Utsu.  A statistical study on the occurrence of aftershocks. , 1961 .

[14]  C. J. Byrne.  Instrument noise in seismometers , 1961 .

[15]  M. Ewing,et al.  Continental margins and geosynclines: The east coast of North America north of Cape Hatteras , 1959 .

[16]  P. L. Willmore,et al.  The application of the Maxwell impedance bridge to the calibration of electromagnetic seismographs , 1959 .

[17]  G. Woollard.  Areas of tectonic activity in the United States as indicated by earthquake epicenters , 1958 .

[18]  E. Berg,et al.  Seismological studies of the Western Rift Valley of Africa , 1958 .

[19]  H. Benioff,et al.  The aftershock sequence of the Kamchatka earthquake of November 4, 1952 , 1958 .

[20]  S. Suyehiro,et al.  Observation of Near-by Microearthquakes with Ultra Sensitive Seismometers at Matsushiro, Japan. , 1958 .

[21]  C. Tsuboi.  Energy Accounts of Earthquakes in and near Japan , 1957 .

[22]  T. Asada.  Observations of Near-by Microearthquakes with Ultra Sensitive Seismometers , 1957 .

[23]  J. L. Baum,et al.  GEOLOGY AND STRUCTURE OF THE FRANKLIN-STERLING AREA, NEW JERSEY , 1956 .

[24]  S. Katz.  Seismic study of crustal structure in Pennsylvania and New York , 1955 .

[25]  A Statistical Study on the Occurrence of Small Earthquakes III , 1953 .

[26]  Energy Law of Earthquake Occurrence in the Vicinity of Tokyo. , 1952 .

[27]  W. A. White.  BLUE RIDGE FRONT—A FAULT SCARP , 1950 .

[28]  B. Gutenberg,et al.  Seismicity of the Earth and associated phenomena , 1950, MAUSAM.

[29]  L. D. Leet.  Earthquakes in Northeastern America, July-December, 1937 , 1938 .

[30]  M. Collins.  Local earthquakes in New England , 1937 .

[31]  R. Daly.  The changing world of the ice age , 1934 .

[32]  U. S. Coast.  United States Earthquakes, 1938 , 1933 .

[33]  G. W. Stose.  Possible Post-Cretaceous Faulting in the Appalachians , 1927 .