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Estimation of radiated energy using the KiK-net downhole records—old method for modern data

Kanamori, Hiroo and Ross, Zachary E. and Rivera, Luis (2020) Estimation of radiated energy using the KiK-net downhole records—old method for modern data. Geophysical Journal International, 221 (2). pp. 1029-1042. ISSN 0956-540X. doi:10.1093/gji/ggaa040.

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We use KiK-net (NIED) downhole records to estimate the radiated energy, E_R, of 29 Japanese inland earthquakes with a magnitude range from M_w = 5.6 to 7.0. The method is based on the work of Gutenberg and Richter in which the time integral of S-wave ground-motion velocity-squared is measured as a basic metric of the radiated energy. Only stations within a distance of 100 km are used to minimize complex path and attenuation effects. Unlike the teleseismic method that uses mainly P waves, the use of S waves which carry more than 95 per cent of the radiated energy allows us to obtain robust results. We calibrate the method using synthetic seismograms to modernize and improve the Gutenberg–Richter method. We compute synthetic seismograms for a source model of each event with a given source function (i.e. known E_R), the actual mechanism and the source-station geometry. Then, we compare the given E_R with the computed energy metric to correct for the unknown effect of wave propagation and the mechanism. The use of downhole records minimizes the uncertainty resulting from the site response. Our results suggest that the currently available estimates of E_R from teleseismic data are probably within a factor of 3, on average, of the absolute value. The scaled energy e_R ( = E_R/M₀) is nearly constant at about 3 × 10⁻⁵ over a magnitude range from M_w = 5.6 to 7.0 with a slight increasing trend with M_w. We found no significant difference in e_R between dip-slip and strike-slip events.

Item Type:Article
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URLURL TypeDescription
Kanamori, Hiroo0000-0001-8219-9428
Ross, Zachary E.0000-0002-6343-8400
Rivera, Luis0000-0002-0726-5445
Additional Information:© The Author(s) 2020. Published by Oxford University Press on behalf of The Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Revision received: 26 August 2019; Received: 06 January 2020; Accepted: 13 January 2020; Published: 23 January 2020. The KiK-net and K-NET data used in this study were provided by the National Research Institute for Earth Science and Disaster Resilience (NIED) of Japan. We thank Françoise Courboulex and an anonymous reviewer for their comments and suggestions, Men-Andrin Meier for providing us with the results of Vs30 computed for the KiK-net downhole station, George Choy and Lingling Ye for providing us with the teleseismic energy estimates for some of the events we studied, and Sunyoung Park for discussion on near-surface wave interactions.
Group:Seismological Laboratory
Issue or Number:2
Record Number:CaltechAUTHORS:20200430-104147775
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Official Citation:Hiroo Kanamori, Zachary E Ross, Luis Rivera, Estimation of radiated energy using the KiK-net downhole records—old method for modern data, Geophysical Journal International, Volume 221, Issue 2, May 2020, Pages 1029–1042,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102926
Deposited By: Tony Diaz
Deposited On:30 Apr 2020 17:56
Last Modified:16 Nov 2021 18:16

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