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Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt
Published on: August 7, 2017
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Multi-phase seismic source imprint of tropical cyclones
Lise Retailleau1,2, Lucia Gualtieri3
1Université de Paris, Institut de physique du globe de Paris, CNRS, Paris, France. retailleau@ipgp.fr.
Nature Communications
|April 7, 2021
Summary
Tropical cyclones generate seismic waves (secondary microseisms) detected globally. This study analyzes typhoon seismic sources, comparing observations with wave models to understand generation mechanisms and sea state insights.
Area of Science:
- Earthquake seismology
- Oceanography
- Atmospheric science
Background:
- Ocean activity, driven by winds, couples with the solid Earth, generating seismic signals.
- Secondary microseisms (2-10 s period) are the largest background seismic wavefield.
- Tropical cyclones create strong, localized secondary microseism sources detectable by seismic arrays.
Purpose of the Study:
- To assess and compare seismic sources (P, SV, SH waves) of typhoon Ioke (2006) during its extra-tropical transition.
- To understand the generation mechanisms of these seismic signals.
- To evaluate the influence of ocean resonance and coastal wave reflection.
Main Methods:
- Analysis of seismic signals from typhoon Ioke (2006).
- Comparison of observed multi-phase seismic sources with theoretical sources from a numerical ocean wave model.
- Assessment of ocean resonance and coastal wave reflection effects.
Main Results:
- Seismic sources associated with typhoon Ioke were identified and characterized.
- Observed seismic sources were compared with theoretical models, revealing insights into generation mechanisms.
- The study demonstrated that seismic source location and extent are dependent on wave period and seismic phase (P, SV, SH).
Conclusions:
- The study provides crucial information on seismic body wave generation by typhoons for ambient noise imaging.
- Findings offer complementary insights into sea state conditions, supplementing satellite data.
- Understanding seismic sources aids in interpreting Earth's response to oceanic phenomena.
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