What is it about?
The paper shows, how the radiated seismic energy can be calculated from earthquake finite-fault models, such as those published by the USGS for M>7 events. The proposed method is an approximation based on the overdamped dynamics earthquake rupture model, but it works quite well in comparison to the values calculated directly from seismograms. The previous papers show (e.g., Senatorski, Physica A, 2005; GJI, 2006; PEPI, 2007; 2008), that the proposed radiated energy estimation can also be thought of as a measure of nonuniformity of the coseismic slip velocity field, with its minimum value for the uniform (both in time and space) distribution of slips, in analogy to entropy in thermodynamics and statistical physics. In that sense, it is a valuable parameter to characterize an earthquake rupture process. It enables us to distinguish among different earthquakes with similar seismic moments or moment magnitudes.
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Why is it important?
Finite-fault earthquake slip models are essential for understanding large earthquake source processes (e.g., Hayes, EPSL, 2017). Earthquake characteristics and the scaling relations among earthquake parameters based on such models can lead to better understanding of seismicity and some revision of present views and theories.
Perspectives
This article is one in a series of published and unpublished papers, in which earthquakes are perceived as slip velocity fields that can be characterized and modeled by using various methods used in other domains of physics. I hope my future work based on the same view will shed light on different aspects of earthquake physics and statistics (e.g., Senatorski, PEPI, 2017).
Piotr Senatorski
Read the Original
This page is a summary of: Radiated energy estimations from finite-fault earthquake slip models, Geophysical Research Letters, May 2014, American Geophysical Union (AGU),
DOI: 10.1002/2014gl060013.
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