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Title: Seismicity and structure of Akutan and Makushin Volcanoes, Alaska, using joint body and surface wave tomography

Journal Article · · Journal of Geophysical Research. Solid Earth
DOI:https://doi.org/10.1002/2014JB011616· OSTI ID:1221159
 [1];  [1];  [2];  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. of Science and Technology of China, Hefei (China). Laboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Science
  3. Univ. of Wisconsin, Madison, WI (United States). Department of Geoscience
+ Show Author Affiliations

Abstract 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.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Contributing Organization:
National Science Foundation, Arlington, Virginia (United States)
Grant/Contract Number:
EAR-1358619; 20120047ER; SC12-BAA12-17-NDD03; 20130807PRD3; AC52-06NA25396; LDRD-20120047ER; G10AC0618
OSTI ID:
1221159
Alternate ID(s):
OSTI ID: 1785854
Report Number(s):
LA-UR-15-20137
Journal Information:
Journal of Geophysical Research. Solid Earth, Vol. 120, Issue 2; ISSN 2169-9313
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 35 works
Citation information provided by
Web of Science

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