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
Distribution Statement : APPROVED FOR PUBLIC RELEASE