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Archive for the ‘tectonic plates’ Category

Large Earthquake Strikes Off the Coast of Japan

Posted by feww on December 21, 2008

Magnitude 6.5 Earthquake Strikes Off the Coast of Honshu, Japan

The Mainshock was followed by a cluster of at least 5 moderate to strong aftershocks magnitude 4.8  to 5.3.

Update: A magnitude 6.0 aftershock struck near location of mainshock [36.592°N, 142.269°E,] on December 21, 2008 at 09:16:44 UTC.

10-degree Map Centered at 35°N,140°E

japan-21-dec-08
Source: USGS

Earthquake Details

Magnitude: 6.5

Date-Time: Saturday, December 20, 2008 at 10:29:22 UTC

Location: 36.603°N, 142.356°E
Depth: 10 km (6.2 miles) set by location program
Region: OFF THE EAST COAST OF HONSHU, JAPAN
Distances:

  • 140 km (85 miles) ESE of Iwaki, Honshu, Japan
  • 170 km (105 miles) E of Mito, Honshu, Japan
  • 210 km (130 miles) SE of Fukushima, Honshu, Japan
  • 255 km (160 miles) ENE of TOKYO, Japan

Location Uncertainty: horizontal +/- 8.7 km (5.4 miles); depth fixed by location program

Sourc: USGS NEIC (WDCS-D)

Event ID: us2008avan

Seismicity in 2008

japan-21-dec-08-n2

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Posted in Earthquake cluster, earthquake damage, Japan shake, Mito, tectonic plates | Tagged: , , , , | Leave a Comment »

Magnitude 6.2 Quake Hits Honshu, Japan

Posted by feww on December 4, 2008

UPDATE: The Honshu quake detailed below has been downgraded to a 5.7Mw by USGS.

A Large Mag 6.2 Earthquake Hits Near the East Coast of Honshu, Japan

The following details were provided by USGS Earthquake Hazards Program:

Magnitude: Mw 6.2 [Later downgraded to Mw 5.7]

Date-Time:

  • Wednesday, December 03, 2008 at 23:16:58 UTC
  • Thursday, December 04, 2008 at 08:16:58 AM at epicenter

Location: 38.566°N, 142.762°E
Depth: 35 km (21.7 miles) set by location program
Region: Near the East Coast of Honshu, Japan

Distances:

  • 170 km (105 miles) ENE of Sendai, Honshu, Japan
  • 190 km (120 miles) SE of Morioka, Honshu, Japan
  • 220 km (140 miles) ENE of Fukushima, Honshu, Japan
  • 420 km (260 miles) NE of TOKYO, Japan

[Mainshock was followed by a strong aftershock measuring Mw5.2 located at 38.555°N, 142.840°E, Thursday, December 04, 2008 at 12:10:54 PM time at epicenter.]

Source: USGS

No immediate reports of tsunami, damage or injuries as yet.

sendai-earthquake


Map of MMI contours plotted over population per ˜1 square km (see gray scale bar on top of map). The regions of integer MMI values are separated by the thick contour lines and labeled with Roman numerals. The total population exposure to a given MMI value is obtained by summing the population between the thick contour lines. This total is shown in population exposure table. Overall, the population in this region resides in structures that are a mix of vulnerable and earthquake resistant construction. A magnitude 6.6 earthquake 378 km Northeast of this one struck Niigata, Japan on October 23, 2004 (UTC), with estimated population exposures of 481,000 at intensity IX or greater and 386,000 at intensity VIII, resulting in an estimated 67 fatalities. Recent earthquakes in this area have caused, landslides and fires that may have contributed to losses. USGS

ja-map
Map of japan. USGS

sendai-quake-loc

Earthquake Location: USGS

Japan sits atop the Eurasian, Pacific, Philippine and North American tectonic plates whose movements cause numerous earthquakes. The country experiences about 20 percent of the world’s major earthquakes of magnitude 6 or greater.

Did you know?

With an estimated total death toll of 88,072 [as of yesterday, Dec 3, 2008,] this year has seen the second worst number of human casualties caused by earthquakes since 1980. The largest earthquake/ tsunami related casualties for the 29-year period occurred in 2004 with an estimated total of 228,802 deaths.  [The stats are based on USGS data.

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Posted in fires, landslides, population exposure, tectonic plates, Tokyo | Tagged: , , , , | 2 Comments »

Powerful Offshore Quake Strikes Japan’s Eastern Coast

Posted by feww on July 19, 2008

Magnitude 7.0 Quake – OFF THE EAST COAST OF HONSHU, JAPAN

The following is a release by the United States Geological Survey, National Earthquake Information Center:


Earthquake Location: Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green. Map: USGS

An earthquake occurred about 125 km (75 miles) ENE of Iwaki, Honshu, Japan or about 130 km (80 miles) ESE of Sendai, Honshu, Japan or about 305 km (190 miles) NE of TOKYO, Japan at 8:39 PM MDT, Jul 18, 2008 (Jul 19 at 11:39 AM local time in Japan). The magnitude and location may be revised when additional data and further analysis results are available. No reports of damage or casualties have been received at this time; however, this earthquake may have caused damage due to its location and size.

The mainshock was followed by a 5.3 aftershock. A tsunami warning was issued for sections of Japan’s eastern coast. However, only a small wave of about 20 cm was reported.

Japan sits atop the Eurasian, Pacific, Philippine and North American tectonic plates whose movements cause numerous earthquakes. The country experiences about 20 percent of the world’s major earthquakes of magnitude 6 or greater.

Posted in China, earthquake activist, energy, environment, health, tectonic plates | Tagged: , , , , | 4 Comments »