July 11, 2008
Earthquake Research Committee,
Headquarters for Earthquake Research Promotion
* On June 14, there was a M7.2 earthquake# at a depth of approximately 10km in the southern inland area of Iwate prefecture. This event had a maximum seismic intensity 6 Upper in Iwate and Miyagi prefectures, and caused damage with 13 fatalities, 10 missing people, and approximately 450 injured people. to supplementary reports
# Japan Meteorological Agency named this earthquake the Iwate-Miyagi Nairiku Earthquake in 2008.
* On June 26, there was a M5.4 earthquake at a depth of approximately 55km off-shore of Urakawa. The focal mechanism showed a reverse fault with a compression axis in a WNW-ESE direction. This event occurred at the boundary between the Pacific and the continental plates. to supplementary reports
* (The Iwate-Miyagi Nairiku Earthquake in 2008 and its aftershock activity are described in a separate section.) to supplementary reports
* On June 13, there was a M4.7 earthquake at a depth of approximately 15km in southern Nagano prefecture. The focal mechanism showed a strike-slip fault with a compression axis in a NW-SE direction. This event occurred at a shallow location within the crust.
* There have been no anomalous changes observed in the GPS data for the Tokai region. to supplementary reports
There was no remarkable activity. to supplementary reports
There was no remarkable activity. to supplementary reports
* On June 1, there was a M6.2 earthquake under the northern Philippines [near the Philippines].
[ ] was the regional name of the epicenter used in the Japan Meteorological Agency announcement.
* On July 5, there was a M5.2 earthquake at a depth of approximately 50km off-shore of Ibaraki prefecture. The focal mechanism showed a reverse fault with a compression axis in a WNW-ESE direction. This event occurred at the boundary between the Pacific and the continental plates.
* On July 8, there was a M6.1 earthquake near Okinoerabujima [under the ocean area near the Okinawa Main Island]. The focal mechanism showed a reverse fault with a compression axis in a NW-SE direction. This event occurred near the boundary between the Philippine Sea and the continental plates.
[ ] was the regional name of the epicenter used in the Japan Meteorological Agency announcement.
July 11, 2008
The following are the numbers of earthquakes by magnitude that occurred in Japan and the surrounding area during June 2008.
(reference)
The following regions have been noted as having major seismic activity during the period from June 2007 to the end of May 2008.
| - Niigataken Chuetsu-oki Earthquake in 2007 | M6.8 on July 16, 2007 (depth approximately 10km) | |
| - Off-shore west of Sakhalin | M6.4 on August 2, 2007 | |
| - Near the coastal area of Kujukurihama | seismic activity with M5.3 on August 16, and M4.8 on August 18, 2007 | |
| - Coast of Peru | M8.0 on August 16, 2007 | |
| - Western Kanagawa prefecture | M4.9 on October 1, 2007 (depth approximately 15km) | |
| - Noto region, Ishikawa prefecture | M4.8 on January 26, 2008 (depth approximately 10km) | |
| - Off-shore of Ibaraki prefecture | M7.0 on May 8, 2008 |
There is no supplementary information for the Hokkaido region.
There is no supplementary information for the Tohoku region.
"There have been no anomalous changes observed in the GPS data for the Tokai region.":
(This evaluation is in agreement with the views presented at the procedural meeting on June 30 of the Assessment Committee for Areas under Intensified Measures against Earthquake Disaster. (see reference below))
(reference)
"Recent seismic and crustal activity in the Tokai region and its vicinity"
(Japan Meteorological Agency, Department of Seismology and Volcanology, June 30, 2008)
"So far, there have been no changes of activity which are likely to be associated with the so-called Tokai earthquake.
There was no remarkable seismic activity in general. Under central Shizuoka prefecture, the seismicity remains at a level lower than normal within the plate, and higher within the crust. In other regions, seismic activity is generally at a normal level.
There were no notable changes observed in crustal movements in the Tokai region and its neighboring areas."
There is no supplementary information for the Kinki-Chugoku-Shikoku region.
There is no supplementary information for the Kyushu-Okinawa region.
Reference 1
Earthquakes that are described in the "Evaluation of Seismic Activity" (Monthly Report of Seismic Activity in Japan) have the following features.
Reference 2
Information that is described in the "Supplementary Information to the Evaluation" includes: