REGISTRE SÍSMIC OBTINGUT A L'OBSERVATORI FABRA (BARCELONA) DE L'ESDEVENIMENT MÉS IMPORTANT OCORREGUT EL DIA 23 D'OCTUBRE DE 2004 A L'ILLA DE HONSHU (JAPÓ)

INFORMACIO PROPORCIONADA PEL "UNITED STATES GEOLOGICAL SURVEY"

Magnitude 6.5 - NEAR THE WEST COAST OF HONSHU, JAPAN
2004 October 23 08:56:01 UTC

Preliminary Earthquake Report
U.S. Geological Survey, National Earthquake Information Center
World Data Center for Seismology, Denver

Magnitude 6.5 Date-Time Saturday, October 23, 2004 at 08:56:01 (UTC) = Coordinated Universal Time Saturday, October 23, 2004 at 5:56:01 PM = local time at epicenter Time of Earthquake in other Time Zones Location 37.199°N, 138.812°E Depth 15.8 km (9.8 miles) set by location program Region NEAR THE WEST COAST OF HONSHU, JAPAN Distances 80 km (50 miles) SSW of Niigata, Honshu, Japan 85 km (50 miles) NE of Nagano, Honshu, Japan 90 km (55 miles) NNW of Maebashi, Honshu, Japan 190 km (120 miles) NNW of TOKYO, Japan Location Uncertainty horizontal +/- 6.7 km (4.2 miles); depth fixed by location program Parameters Nst=232, Nph=232, Dmin=91 km, Rmss=1.02 sec, Gp= 65°, M-type=moment magnitude (Mw), Version=9 Source USGS NEIC (WDCS-D) Event ID uspyal

The Islands of Japan lie on a ring of seismically active plate boundaries that surround the Pacific Ocean known as the Ring of Fire. Earthquakes throughout Japan are caused by the relative motion of several major and minor tectonic plates including the Pacific plate, the Philippine Sea plate, the Okhotsk plate, and the Amur plate. Earthquakes result from slippage on the interface between the plates and on faults some distance from the plates boundaries. This thrust earthquake, of October 23rd 2004, occurred within the Okhotsk plate about 350 km east of the Japan Trench where the Pacific plate subducts beneath the overriding Okhotsk plate. Within the last 30 years, there have been several significant earthquakes in region nearby this earthquake. These include a June, 1964 magnitude 7.4 quake that occurred 125 km to the north and killed 36 people and an April, 1995 magnitude 5.4 quake that occurred 90 km to the north and injured at least 39 people. This century, the country of Japan has suffered nine devastating earthquakes that have killed more than 1000 people. These include the 1923 magnitude 7.9 earthquake that triggered the great Tokyo fire and killed 143,000 people and the more recent 1995 6.9 Kobe earthquake that killed 5,500 people.

Location Maps: 10-degree NEIC Maps Did you feel it? Report shaking and damage at your location. You can also view a map displaying accumulated data from your report and others. NEIC Moment Tensor Solution Historical Moment Tensor Solutions Seismic Hazard Map Historical Seismicity Theoretical P-Wave Travel Times Phase Data Seismic Record Section News Release Earthquake Information for JAPAN Archive of newsworthy events

News Links Relief Workers Sift Through Wreckage in Japan, Series of Strong Temblors Kill at Least 21 People Japan earthquake kills 20 News Links Japan Earthquakes Kill 7, Injure 700 - ABC International

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For more information, go to http://neic.usgs.gov/

Registre del mateix esdeveniment a  l'estacio HGN - Heimansgroeve, Limburg, Països Baixos i informació focal proporcionada per la VEBSN (Virtual European Broadband Seismic Network) de l'ORFEUS (Observatories and Research Facilities for European Seismology)

			Servidor ISEV (Informació Sísmica En Viu) de la Secció de Sismologia de l'Observatori Fabra. Aquesta pàgina web és una cooperació entre el Departament d’Astronomia i Meteorologia (DAM) de la Universitat de Barcelona (UB), l'Observatori Fabra de la Reial Acadèmia de Ciències i Arts de Barcelona (RACAB) i el Laboratori d'Estudis Geofísics "Eduard Fontserè" de l'Institut d'Estudis Catalans. Pàgina creada per Josep Vila (jvilaam.ub.es) el 25 d'octubre de 2004.