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Seismicity and structure of Akutan and Makushin Volcanoes, Alaska, using joint body and surface wave tomography
Author(s) -
Syracuse E. M.,
Maceira M.,
Zhang H.,
Thurber C. H.
Publication year - 2015
Publication title -
journal of geophysical research: solid earth
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.983
H-Index - 232
eISSN - 2169-9356
pISSN - 2169-9313
DOI - 10.1002/2014jb011616
Subject(s) - volcano , geology , seismology , induced seismicity , magma , magma chamber , joint (building) , rayleigh wave , seismic tomography , surface wave , geophysics , mantle (geology) , physics , architectural engineering , engineering , astronomy
Joint inversions of seismic data recover models that simultaneously fit multiple constraints while playing upon the strengths of each data type. Here we jointly invert 14 years of local earthquake body wave arrival times from the Alaska Volcano Observatory catalog and Rayleigh wave dispersion curves based upon ambient noise measurements for local V p , V s , and hypocentral locations at Akutan and Makushin Volcanoes using a new joint inversion algorithm. The velocity structure and relocated seismicity of both volcanoes are significantly more complex than many other volcanoes studied using similar techniques. Seismicity is distributed among several areas beneath or beyond the flanks of both volcanoes, illuminating a variety of volcanic and tectonic features. The velocity structures of the two volcanoes are exemplified by the presence of narrow high‐ V p features in the near surface, indicating likely current or remnant pathways of magma to the surface. A single broad low‐ V p region beneath each volcano is slightly offset from each summit and centered at approximately 7 km depth, indicating a potential magma chamber, where magma is stored over longer time periods. Differing recovery capabilities of the V p and V s data sets indicate that the results of these types of joint inversions must be interpreted carefully.