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Possible causes for the seismic activity observed in Cotopaxi Volcano, Ecuador
Author(s) -
Ruiz Mario,
Guillier Bertrand,
Chatelain JeanLuc,
Yepes Hugo,
Hall Minard,
Ramon Patricio
Publication year - 1998
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/98gl01689
Subject(s) - volcano , geology , seismology , unrest , elevation (ballistics) , tectonics , period (music) , physics , geometry , mathematics , politics , political science , acoustics , law
Continuous monitoring of Cotopaxi volcano from January 1989 to September 1997 shows that it is subject to a steady shallow Long Period (LP) activity. LP events are concentrated in a column with a diameter of about 3 km and a height of about 12 km, between an elevation of 4 km and 8 km depth. They do not occur in swarms, nor have there been periods of complete calm. High frequency volcano‐tectonic (VT) events are mostly located on the northeastern side of the LP column, with the maximum activity of both types of events coinciding in depth. LP activity cannot be related to unrest of the volcano. The most likely explanation for the continuous occurrence of LP events beneath Cotopaxi is that they are produced by the interaction of glacier thaw water and hot material at shallow depths. The relative spatial distribution of both type of events in two adjacent zones suggest that VT and LP activities are interconnected.