Tag

Hazard Assessment

All articles tagged with #hazard assessment

science29 days ago•5 min saved

Millennium-High Stress on California Faults Signals Elevated Megquake Risk

A multinational team using a physics-based model finds stress on Southern California’s San Andreas and San Jacinto fault systems is at or near the highest levels in about a thousand years, with key segments showing about 2.8–3.6 MPa of stress. While this doesn’t predict when an earthquake will occur, the results indicate the region is critically loaded, the Cajon Pass “earthquake gate” could open under certain rupture scenarios, and the findings underscore the ongoing need for hazard assessment, infrastructure planning, and preparedness.

via ScienceAlert|

#cajon-pass #earthquakes #hazard-assessment

earth-science2 years ago•4 min saved

"Reevaluating the Role of Earthquakes in Glacial Lake Outburst Floods"

A new study challenges the assumption that earthquakes are the primary driver of glacial lake outburst floods, suggesting that the triggering processes may be more complex than previously thought. Research in the Andes found that only a small number of earthquakes were associated with outburst floods, and further analysis revealed that seismic activity may not always lead to dam destabilization. The study highlights the need for more research to determine the primary drivers of these floods in order to improve hazard assessments and mitigate their impacts on the environment and communities.

via Phys.org|

#climate-change #earth-science #earthquakes

geoscience2 years ago•4 min saved

"Unraveling Santorini's Historical Mystery Through Scientific Drilling"

An international team of scientists has uncovered evidence of a historical submarine eruption of the Kameni volcano on Santorini, supporting historical records of an underwater eruption in 726 CE. Through drilling and geochemical analyses, they found a layer of pumice and ash, up to 40 meters thick, linked to the eruption, challenging previous hypotheses about the volcanic system's behavior. These findings have significant implications for hazard assessment and highlight the need for greater attention to submarine eruptions.

via Phys.org|

#geoscience #hazard-assessment #historical-mystery

natural-disasters2 years ago•3 min saved

"Iceland's Unprecedented Volcanic Activity: A Historic Challenge"

Prime Minister Katrín Jakobsdóttir addressed Parliament about the challenges posed by recent volcanic activity on the Reykjanes Peninsula, emphasizing that Iceland is facing its most significant natural disaster challenges since its founding. She highlighted the need for a comprehensive hazard assessment, led by the Icelandic Meteorological Office, to be completed by 2025, covering earthquakes, lava flow, and the impact of ash and gases in the atmosphere.

via IcelandReview|

#hazard-assessment #iceland #natural-disasters

earth-science2 years ago•6 min saved

Ciomadul study reveals rapid and explosive eruptions of long dormant volcanoes

Hungarian scientists studying the Ciomadul volcano have found that even after tens of thousands of years of dormancy, a volcano can rapidly become active and pose a previously unknown threat. By analyzing the mineral composition of volcanic rocks, the researchers identified the conditions and processes that lead to explosive eruptions. They discovered that the presence of distinct amphibole compositions in the magma played a key role in triggering the explosive eruptions. This research highlights the importance of studying long-dormant volcanoes and understanding their potential hazards.

via Phys.org|

#dormancy #earth-science #eruption

earth-science3 years ago•5 min saved

From Hazard to Relief: Lessons from Santorini and Southern France Tsunami Alerts.

Researchers from GEOMAR Helmholtz Centre for Ocean Research Kiel and other institutions studied the seafloor around Santorini to understand the genesis of the Minoan tsunami that devastated the coast of Crete 3,600 years ago. They found undulating seafloor bedforms that were formed by pyroclastic flows and instabilities of the volcanic flanks. The researchers estimate that two cubic kilometers of material moved down the volcanic flanks during the Minoan eruption, generating a huge tsunami wave. The study emphasizes the importance of understanding flank instabilities for tsunami hazard assessment at active volcanoes.

via Phys.org|

#earth-science #hazard-assessment #minoan-eruption