|
|
 |
|||||||||||||||||
|
|||||||||||||||||
 |
|||||||||||||||||
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
1 U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025, USA
2 Geophysical Institute, University of Alaska, P.O. Box 757320, Fairbanks, Alaska 99775, USA
3 Green Engineering, 2215 Curtis Street, Berkeley, California 94702, USA
4 U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025, USA
5 Department of Earth and Space Sciences, University of Washington, Box 351310, Seattle, Washington 98195, USA
The aftershock zone of the 3 November 2002, M = 7.9 earthquake that ruptured along the right-slip Denali fault in south-central Alaska has been investigated by using gravity and magnetic, magnetotelluric, and deep-crustal, seismic reflection data as well as outcrop geology and earthquake seismology. Strong seismic reflections from within the Alaska Range orogen north of the Denali fault dip as steeply as 25°N and extend to depths as great as 20 km. These reflections outline a relict crustal architecture that in the past 20 yr has produced little seismicity. The Denali fault is nonreflective, probably because this fault dips steeply to vertical. The most intriguing finding from geophysical data is that earthquake aftershocks occurred above a rock body, with low electrical resistivity (>10 
·m), that is at depths below 
10 km. Aftershocks of the Denali fault earthquake have mainly occurred shallower than 10 km. A high geothermal gradient may cause the shallow seismicity. Another possibility is that the low resistivity results from fluids, which could have played a role in locating the aftershock zone by reducing rock friction within the middle and lower crust.
Key Words: earthquakes • Alaska Range • crustal structure • seismic reflection data • magnetotelluric data • potential field data
This article has been cited by other articles:
|
|
 |
|
  A. Chaudhary, S. K. Haack, J. W. Duris, and T. L. Marsh Bacterial and Archaeal Phylogenetic Diversity of a Cold Sulfur-Rich Spring on the Shoreline of Lake Erie, Michigan Appl. Envir. Microbiol., August 1, 2009; 75(15): 5025 - 5036. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 B.-Y. Liao and H.-C. Huang Rupture Process of the 2002 Mw 7.9 Denali Earthquake, Alaska, Using a Newly Devised Hybrid Blind Deconvolution Method Bulletin of the Seismological Society of America, February 1, 2008; 98(1): 162 - 179. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 M. A. Fisher, L. Pellerin, W. J. Nokleberg, N. A. Ratchkovski, and J. M.G. Glen Crustal structure of the Alaska Range orogen and Denali fault along the Richardson Highway Geological Society of America Special Papers, January 1, 2007; 431(0): 43 - 53. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
P.T.C. Hammer and R.M. Clowes Lithospheric-scale structures across the Alaskan and Canadian Cordillera: Comparisons and tectonic implications Geological Society of America Special Papers, January 1, 2007; 433(0): 99 - 116. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. L. Macalady, E. H. Lyon, B. Koffman, L. K. Albertson, K. Meyer, S. Galdenzi, and S. Mariani Dominant Microbial Populations in Limestone-Corroding Stream Biofilms, Frasassi Cave System, Italy Appl. Envir. Microbiol., August 1, 2006; 72(8): 5596 - 5609. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
T. M. Brocher, G. S. Fuis, W. J. Lutter, N. I. Christensen, and N. A. Ratchkovski Seismic Velocity Models for the Denali Fault Zone along the Richardson Highway, Alaska Bulletin of the Seismological Society of America, December 1, 2004; 94(6B): S85 - S106. [Abstract] [Full Text] [PDF]
|
|
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
