Plate Tectonics and the Discrimination of Underground Explosions from Earthquakes
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1975
- Accession Number
- ADA018855
Entities
People
- Andrew J Murphy
Organizations
- Lamont–Doherty Earth Observatory