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

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 Vp, Vs, 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-Vp features in the near surface, indicating likely current or remnant pathways of magma to the surface. A single broad low-Vp 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 Vp and Vs datasets indicate that the results of these types of joint inversions must be interpreted carefully.
 [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
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 2169-9313
Grant/Contract Number:
EAR-1358619; 20120047ER; SC12-BAA12-17-NDD03; 20130807PRD3; AC52-06NA25396
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Solid Earth
Additional Journal Information:
Journal Volume: 120; Journal Issue: 2; Journal ID: ISSN 2169-9313
American Geophysical Union
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE;USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Contributing Orgs:
National Science Foundation, Arlington, Virginia (United States)
Country of Publication:
United States