Chapter two: Phenomenology of tsunamis II: Scaling, event statistics, and inter-event triggering
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Abstract
Observations related to tsunami catalogs are reviewed and described in a phenomenological framework. An examination of scaling relationships between earthquake size (as expressed by scalar seismic moment and mean slip) and tsunami size (as expressed by mean and maximum local run-up and maximum far-field amplitude) indicates that scaling is significant at the 95% confidence level, although there is uncertainty in how well earthquake size can predict tsunami size (R2 ~ 0.4-0.6). In examining tsunami event statistics, current methods used to estimate the size distribution of earthquakes and landslides and the inter-event time distribution of earthquakes are first reviewed. These methods are adapted to estimate the size and inter-event distribution of tsunamis at a particular recording station. Using a modified Pareto size distribution, the best-fit power-law exponents of tsunamis recorded at nine Pacific tide-gauge stations exhibit marked variation, in contrast to the approximately constant power-law exponent for inter-plate thrust earthquakes. With regard to the inter-event time distribution, significant temporal clustering of tsunami sources is demonstrated. For tsunami sources occurring in close proximity to other sources in both space and time, a physical triggering mechanism, such as static stress transfer, is a likely cause for the anomalous clustering. Mechanisms of earthquake-to-earthquake and earthquake-to-landslide triggering are reviewed. Finally, a modification of statistical branching models developed for earthquake triggering is introduced to describe triggering among tsunami sources.
Publication type | Article |
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Publication Subtype | Journal Article |
Title | Chapter two: Phenomenology of tsunamis II: Scaling, event statistics, and inter-event triggering |
Series title | Advances in Geophysics |
DOI | 10.1016/B978-0-12-380938-4.00002-1 |
Volume | 53 |
Year Published | 2012 |
Language | English |
Publisher | Elsevier |
Publisher location | New York, NY |
Contributing office(s) | Pacific Coastal and Marine Science Center |
Description | 58 p. |
First page | 35 |
Last page | 92 |
Online Only (Y/N) | N |
Additional Online Files (Y/N) | N |
Google Analytic Metrics | Metrics page |