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Source discrimination and yield determination using high-frequency waveform coda envelopes

O3.5-435
Not scheduled
15m
Prinz Eugen Saal

Prinz Eugen Saal

Oral T3.5 Analysis of Seismic, Hydroacoustic and Infrasound Monitoring Data O3.5 Analysis of Seismic, Hydroacoustic and Infrasound Monitoring Data

Speaker

Mr Brent Delbridge (Los Alamos National Laboratory (LANL))

Description

Here, we use coda measurements and apply the waveform envelope spectral ratio method to obtain the measurements necessary for source discrimination and to determine absolute yield and depth of burial at globally distributed test sites. Studies of high‐frequency (>~1 Hz) source processes are crucial for both event discrimination and yield/magnitude determination of smaller seismic events. However, it is difficult to use conventional waveform methods due to the random heterogeneities in the Earth which cause scattering and produce incoherent wave trains in seismograms. To overcome this computational limitation, we neglect the seismic phase information in observed seismic waveforms and instead only utilize envelopes and/or spectrograms. Spectral ratios of envelopes of coda waveforms provide a high precision tool to study the distribution of the energy radiated by the source without require any prior calibration. The goal of this work is to develop a capability which allows us to better understand seismic coda, and the source processes which generate it. This work demonstrations advancements in our understanding of the use of coda methods for seismic source characterization and seeks to expedite its implementation in operational settings.

E-mail [email protected]

Authors

Mr Brent Delbridge (Los Alamos National Laboratory (LANL)) Dr Loïc Viens (Los Alamos National Laboratory (LANL)) Dr Richard Alfaro-Diaz (Los Alamos National Laboratory (LANL))

Presentation materials

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