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<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:contributor>J. Boatwright</dc:contributor>
  <dc:creator>G. L. Choy</dc:creator>
  <dc:date>2009</dc:date>
  <dc:description>We examine two closely located earthquakes in Japan that had identical moment magnitudes M&lt;sub&gt;w&lt;/sub&gt; but significantly different energy magnitudes M&lt;sub&gt;e&lt;/sub&gt;. We use teleseismic data from the Global Seismograph Network and strong-motion data from the National Research Institute for Earth Science and Disaster Prevention's K-Net to analyze the 19 October 1996 Kyushu earthquake (M&lt;sub&gt;w&lt;/sub&gt; 6.7, M&lt;sub&gt;e&lt;/sub&gt; 6.6) and the 6 October 2000 Tottori earthquake (M&lt;sub&gt;w&lt;/sub&gt; 6.7, M&lt;sub&gt;e&lt;/sub&gt; 7.4). To obtain regional estimates of radiated energy E&lt;sub&gt;S&lt;/sub&gt; we apply a spectral technique to regional (&amp;lt;200 km) waveforms that are dominated by S and Lg waves. For the thrust-fault Kyushu earthquake, we estimate an average regional attenuation Q(f) 230f&lt;sup&gt;0:65&lt;/sup&gt;. For the strike-slip Tottori earthquake, the average regional attenuation is Q(f) 180f&lt;sup&gt;0:6&lt;/sup&gt;. These attenuation functions are similar to those derived from studies of both California and Japan earthquakes. The regional estimate of E&lt;sub&gt;S&lt;/sub&gt; for the Kyushu earthquake, 3:8 ?? 10&lt;sup&gt;14&lt;/sup&gt; J, is significantly smaller than that for the Tottori earthquake, E&lt;sub&gt;S&lt;/sub&gt; 1:3 ?? 10&lt;sup&gt;15&lt;/sup&gt; J. These estimates correspond well with the teleseismic estimates of 3:9 ?? 10&lt;sup&gt;14&lt;/sup&gt; J and 1:8 ?? 10&lt;sup&gt;15&lt;/sup&gt; J, respectively. The apparent stress (T&lt;sub&gt;a&lt;/sub&gt; = ??E&lt;sub&gt;s&lt;/sub&gt;/M&lt;sub&gt;0&lt;/sub&gt; with ?? equal to rigidity) for the Kyushu earthquake is 4 times smaller than the apparent stress for the Tottori earthquake. In terms of the fault maturity model, the significantly greater release of energy by the strike-slip Tottori earthquake can be related to strong deformation in an immature intraplate setting. The relatively lower energy release of the thrust-fault Kyushu earthquake can be related to rupture on mature faults at a subduction environment. The consistence between teleseismic and regional estimates of E&lt;sub&gt;S&lt;/sub&gt; is particularly significant as teleseismic data for computing E&lt;sub&gt;S&lt;/sub&gt; are routinely available for all large earthquakes whereas often there are no near-field data.</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1785/0120080078</dc:identifier>
  <dc:language>en</dc:language>
  <dc:title>Differential energy radiation from two earthquakes in Japan with identical M&lt;sub&gt;w&lt;/sub&gt;: The Kyushu 1996 and Tottori 2000 earthquakes</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>