INVESTIGATION OF PKP SEISMIC WAVES

• Main Author: Isherwood, William F
• Other Authors: STANFORD RESEARCH INST MENLO PARK CA
• Format: Text
• Language: English
• Published: 1970
• Subjects: Seismology; Seismic Detection and Detectors; *EARTHQUAKES; *SEISMOLOGICAL STATIONS; ANTARCTIC REGIONS; DATA PROCESSING; DETECTION; EPICENTERS; INSTRUMENTATION; MAGNETIC TAPE; PROPAGATION; SEISMIC WAVES; SEISMOMETERS; PRIMARY WAVES; SEISMIC NOISE; SEISMIC ARRAYS; DEEP FREEZE 1968 OPERATION; Antarctic; Bya; Byrd; Byrd Station; Antarc*; Antarctica
• Online Access: http://www.dtic.mil/docs/citations/AD0712731; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0712731

A four-element seismic array was established at Byrd Station, Antarctica, for investigation of PKP seismic waves. This seismic station (BYA) has been operating continuously since January 18, 1968. Seismic data are recorded on magnetic tape at a level permitting playback at a system magnification of as high as 500,000. Background ground motion amplitudes at Byrd Station were found to be in the order of 10 millimicrons at the center seismometer when heavy equipment was operating, nearby. About 2,700 compressional and shear arrivals were reported in the first 8 months of recording, with epicenters ranging over the entire earth. About 400 of these events have been confirmed as PKP arrivals. The epicentral distance for these arrivals ranged from 110 to 173 degrees, with the majority being from the Japanese and Kurile areas. Data from the first full year of operation are now being processed at SRI. The station was turned over to the USC and GS and is currently being operated by that agency. See also Annual report dated 15 Mar 1969, AD0693340. Sponsored in part by the DARPA.