Accession Number : AD0499591

Title :   Seismic Investigation of Deep Crustal Structure by Reflection Methods.

Descriptive Note : Technical rept.,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE GEOPHYSICS LAB

Personal Author(s) : Mead, Judson

Report Date : 15 AUG 1949

Pagination or Media Count : 41

Abstract : The conclusions may be summarized as follows: (1) the amplitude of the ground motion in the near vicinity of large quarry blasts diminishes approximately as the square of the elapsed time; (2) an important part of the motion is probably caused by the arrival of surface waves reflected from surface structures in the vicinity; (3) no conspicuous vertical reflections from deep crustal structure are recordable in the frequency range of 5 to 30 cycles per second following large quarry blasts; and (4) questionable simultaneous arrivals indicate the possibility of vertical reflections but require further investigation.

Descriptors :   *STRUCTURAL GEOLOGY), (*SEISMIC WAVES, REFLECTION, FAULTS(GEOLOGY), ANGLE OF ARRIVAL, REFRACTION, SEISMOMETERS, BOUNDARY LAYER, ROCK, UNDERGROUND EXPLOSIONS, NITROGLYCERIN.

Subject Categories : Geology, Geochemistry and Mineralogy
      Seismology

Distribution Statement : APPROVED FOR PUBLIC RELEASE