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JB080i005p00733trimble.pdf
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🔗 Source: uusatrg.utah.edu
📊 Size: 2.37 MB
👤 Author: Alan B. Trimble , Robert B. Smith
⬇️ Downloads: 77

Summary

Detailed seismic monitoring of the Hebgen Lake-western Yellowstone Park region has identified a zone of earthquakes extending 80 km from the northwest edge of the Yellowstone calderas to the Madison Valley, including the epicentral area of the 1959 Hebgen Lake earthquake. Focal depths range from near surface to 15 km, with shallower depths over and near the calderas possibly due to increased temperature and pore pressure. Fault plane solutions indicate north-south regional extension and northwest-southeast crustal shortening, suggesting a complex stress distribution controlled by the intersection of the intermountain seismic belt and the central Idaho seismic belt. The region's tectonics are characterized by north-to northwest-trending block faulting, normal faults, and volcanic activity, with the Snake River plain considered a lava-filled tension rift formed by crustal extension. Historical seismicity is divided into pre-1959 activity, documented by felt reports, and post-1959 activity, documented by modern seismographs, with at least 76 earthquakes felt in the region from the late 1800s to 1959, including a devastating magnitude 7.1 earthquake in 1959.

Description

Detailed seismic monitoring of the Hebgen Lake-western Yellowstone Park region has identified a zone of earthquakes extending 80 km from the northwest edge of...

Technical Information

  • File Format: PDF
  • File Size: 2.37 MB
  • Pages: 9
  • Language: EN
  • Author: Alan B. Trimble , Robert B. Smith
  • Total Downloads: 77
  • Last Updated: 8 hours ago

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