Crustal Structure Studies Utilizing Earthquake Sequences

• Main Authors: Gedney, Larry D., Stone, David B., Davies, John N., Johnson, Jean M., Estabrook, Charles H.
• Other Authors: ALASKA UNIV FAIRBANKS
• Format: Text
• Language: English
• Published: 1989
• Subjects: Seismology; *EARTH CRUST; *EARTHQUAKES; EXPLOSIONS; SEQUENCES; CHEMICAL REACTIONS; BARTER ISLAND; NETWORKS; REFRACTION; FAIRBANKS(ALASKA); URBAN AREAS; ALASKA; NORTH(DIRECTION); PE61102F; WUAFOSR2309A2; Fairbanks; Pacific; Yukon; alaska range; Barter Island; Trans Alaska Crustal Transect; Alaska
• Online Access: http://www.dtic.mil/docs/citations/ADA212916; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA212916

The original goal was to use the Dall City earthquake sequence of Feb-Mar '85 to investigate the crustal structure of north-central Alaska. The scope was later modified to include studies of some earthquakes just north of the Alaska Range, the Gold King earthquakes, and later still to include data gathered from chemical explosions detonated by USGS as part of their Trans- Alaska Crustal Transect (TACT) program. The work divided roughly into Dall City events, Gold King events, Yukon Flats Experiment, permanent network/explosion data, and Barter Island - Fairbanks refraction. The models used in this study were applied to most of Alaska, and thus large differences were expected. In general the models for the areas north of Fairbanks are reasonably similar which is consistent with the fact that relocations of events using these different models don't produce any clear preference; and south is expectedly much more complex, given young accreted terranes with an underthrusting Pacific plate.