Accession Number:

ADA018855

Title:

Plate Tectonics and the Discrimination of Underground Explosions from Earthquakes

Descriptive Note:

Semi-annual technical rept. no. 8, 1 Sep 1971-30 Sep 1975

Corporate Author:

LAMONT-DOHERTY GEOLOGICAL OBSERVATORY PALISADES NY

Personal Author(s):

Report Date:

1975-09-01

Pagination or Media Count:

12.0

Abstract:

During the period covered by this semi-annual report 1 January to 30 June 1975, seven general topics of research have been investigated. 1 A study of anomalous events, earthquakes which plot near the explosion population in a M sub s - m sub b diagram, has concluded that all such anomalous events in the eastern Himalayas are natural earthquakes. 2 A study of a foreshock- mainshock-aftershock sequence is being conducted to determine if there are factors other than source depth focal mechanism that control the surface wave magnitude of small events. 3 Three studies are in progress on the topic of Intraplate Tectonics. 4 A study comparing the motions in a half space near a fault with those which occur in a whole space if the surface were absent has been completed. 5 A study is currently in progress to test the validity of various models of the core-mantle boundary using seismograms synthesized by the Langer method of frequency domain calculations. 6 In another study, the excitation of higher mode surface waves by shallow events is being examined. 7 A study is also under way on the possible interrelation among bouyant zones, great earthquakes, and dynamic boundaries of subduction.

Subject Categories:

  • Geology, Geochemistry and Mineralogy
  • Seismology
  • Seismic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE