Open AccessP ‐wave amplitudes in the United States: east–west variations and variability
Author(s) -
Butler Rhett
Publication year - 1984
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1984.tb02220.x
Subject(s) - amplitude , bedrock , magnitude (astronomy) , range (aeronautics) , variation (astronomy) , geology , regional variation , situated , sediment , geodesy , seismology , physical geography , geography , geomorphology , physics , materials science , quantum mechanics , astronomy , artificial intelligence , astrophysics , political science , computer science , law , composite material
Summary The variation of P ‐wave amplitudes between the eastern and western United States is examined by using data from many different amplitude studies. Consideration is given to the geological siting of three groups of stations: (1) all stations, (2) stations situated on hard bedrock, and (3) all stations, but with sediment amplification corrections applied to stations situated on soft sediments. The average estimates of the three cases for the east versus west amplitude variation in the United States range from 0.12 to 0.21 magnitude units. The amplitude variation within the eastern, western and the United States as a whole is expressed in terms of the standard deviation of the station amplitude distribution. For the various regions and station groups studied, σ ranges between 0.11 and 0.20 in magnitude units.