REPORT:
Volcano and Earthquake Hazards in the Crater Lake Region, Oregon

Table of Contents

• Summary
  • Volcanic eruptions within Crater Lake caldera
  • Lahars
  • Eruptions outside of the caldera
  • Volcano-related events of high consequence but low probability
  • Earthquakes
• Introduction
• Geologic setting of Crater Lake
• Reawakening of Mount Mazama
• Potential hazards from an eruption beneath Crater Lake
  • Factors controlling explosivity of eruptions in bodies of water
  • Pyroclastic surges
  • Ballistic blocks and other hazards of eruptions in the lake
  • Proximal hazard zones for explosive eruptions
• Hazards of silicic eruptions outside the caldera
• Hazards of lahars (volcanic debris flows) and their runout flows
  • Potential for lahars at Crater Lake
  • Definition of lahar hazard zone
  • Potential size and flow velocity of lahars at Crater Lake
• Regional volcanism
  • Probability of a future volcanic eruption
  • Hazard zones for regional volcanoes
• Events of high consequence but low probability
  • Another large volume or caldera-forming eruption?
  • Sudden gas release from Crater Lake
  • Catastrophic flood or lahar from drainage of Crater Lake
• Protecting Crater Lake National Park and surrounding communities from volcano hazards
• Earthquakes
  • Seismicity
  • West Klamath Lake fault zone
  • Slip rate and recurrence interval of the WKLFZ
  • Maximum earthquake on the WKLFZ
  • Cascadia subduction zone
  • Volcanic earthquakes
• Landslides may cause large waves on Crater Lake
  • Subaqueous landslides
  • How large must an earthquake be to trigger landslides?
  • Waves generated by landslides into the lake
  • Waves generated by earthquakes
• Preparing for an earthquake affecting the Crater Lake region
• Acknowledgments
• References
• Glossary

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