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Energy partitioning during an earthquake

Kanamori, Hiroo and Rivera, Luis (2006) Energy partitioning during an earthquake. In: Earthquakes: Radiated Energy and the Physics of Faulting. Geophysical Monograph Series. No.170. American Geophysical Union , Washington, DC, pp. 3-13. ISBN 978-0-87590-435-1.

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We investigate the partitioning of energy released during an earthquake to radiated, fracture and thermal energies in an attempt to link various observational results obtained in different disciplines. The fracture energy, E_G, used in seismology is different from that commonly used in mechanics where it is the energy used to produce new crack surface. In the seismological language it includes the energies used for off-fault cracking, and various thermal processes. The seismic moment, M_0, the radiated energy, E_R, and rupture speed, V_R, are key macroscopic parameters. The static stress drop can be a complex function of space, but if an average can be defined as Δ_ τ, it is also a useful source parameter. From the combination of M_0, E_R , and, Δ_ τ we can estimate the radiation efficiency η_R or E_G which can also be estimated independently from V_R. η_R provides a link to the results of dynamic modeling of earthquakes which determines the displacement and stress on the fault plane. Theoretical and laboratory results can also be compared with earthquake data through η_R. Also, the fracture energy estimated from the measurement of the volume and grain size of gouge of an exhumed fault can be linked to seismic data through η_R. In these comparisons, the thermal energy is not included, and it must be estimated independently from estimates of sliding friction during faulting. One of the most challenging issues in this practice is how to average the presumably highly variable slip, stress and frictional parameters to seismologically determinable parameters.

Item Type:Book Section
Kanamori, Hiroo0000-0001-8219-9428
Rivera, Luis0000-0002-0726-5445
Additional Information:© 2006 American Geophysical Union. This paper was based on the vigorous discussions at the Chapman Conference, and we thank all the participants for motivating us to write this paper. We thank Zoe Shipton, William Walter, and Rachel Abercrombie for a thoughtful review of the manuscript.
Series Name:Geophysical Monograph Series
Issue or Number:170
Record Number:CaltechAUTHORS:20110629-112907012
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24250
Deposited By: Tony Diaz
Deposited On:29 Jun 2011 18:50
Last Modified:09 Mar 2020 13:19

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