← Back to Sessions

WITHDRAWN Probabilistic Tsunami Hazard Assessment in the Southern Atlantic

Description: 

WITHDRAWN For sites far from subduction zones, infrequent and less studied sources can contribute significantly to the tsunami hazard. The southern Atlantic Ocean contains one subduction zone, the Scotia, and many volcanic edifices in different phases of activity. This tsunami hazard study implemented an initial deterministic hazard assessment to evaluate sources including earthquakes on subduction zones and local faults, local continental slope landslides, and volcanic flank collapse. In the site region, local faults on the continental shelf were reviewed for evidence of Quaternary activity and sense of slip, and landslide scars along the continental slope were mapped and categorized to determine potential source characteristics. Subduction zone sources were developed using global source databases for both the Sumatra and Scotia subduction zones. Of the deterministic sources, only tsunamis generated by volcanic flank collapse were determined to generate significant waves at the site. Due to many of the potential volcanic sources in the Southern Atlantic not having previous assessments of past or potential flank collapses, an analog database was developed for volumes, source and deposit shape from the well-studied volcanic systems of the Canary Islands and Reunion Island. These data were combined with island-specific characterization that was used to determine the similarity and thus relevance, of that analog data to potential source sites determining the uncertainty of potential tsunami source parameters and weights. In total, seven volcanic edifices were characterized for the deterministic study and subsequently eight were characterized for the probabilistic study.

Session: Data-driven and Computational Characterization of Non-earthquake Seismoacoustic Sources [Poster]

Type: Poster

Date: 4/16/2025

Presentation Time: 08:00 AM (local time)

Presenting Author: Maria

Student Presenter: No

Invited Presentation: 

Poster Number: 66

Authors