CHARACTERISTICS AND PROPERTIES OF EXTREME SEISMIC EVENTS.
Abstract
An equilateral triangular array of three vertical Hall-Sears (HS-10-2) two cycle seismometers approximately one mile apart was installed in New Boston, New Hampshire, to study the statistical properties of large amplitude seismic events in the frequency bands between one and one hundred cycles per second. The time before and after the maximum of 'P' waves was studied to determine the properties of such things as: 1. estimation of the largest event expected, based upon parameters of the measured events; 2. azimuths from the array to the events computed at different amplitude levels primarily to determine the reliability of computed azimuth at different system gains; 3. the return periods of events measured to estimate the expected time between events; 4. the decay of the envelope of the 'P' phase of large events. Two parameters were determined for each event; the average amplitude level in a one second time interval and the number of peaks in that same time interval. The behavior of these parameters and the resulting statistical characteristics of the events are given. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 31, 1966
- Accession Number
- AD0629088
Entities
People
- Richard J. Holt