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Posts Tagged ‘Megathrust earthquake’

Earthquakes Strike near Atka, Alaska

Posted by feww on September 4, 2015

Multiple quakes strike Andreanof Islands

History: A magnitude 8.6Mw megathrust earthquake struck Andreanof Islands (51.5°N 175.7°W) on March 9, 1957, causing Vsevidof Volcano (53.1256°N,168.6937°W) to erupt, and triggering a 16-meter high tsunami that destroyed two communities in Oahu, Hawaii.

Vsevidof Volcano on Umnak Island viewed from an Alaska Airlines en route to Adak, Alaska, May 31, 2012. Credit: Cyrus Read/AVO/USGS.

EQ Details [USGS/EHP]

  • M4.5, 110km SSW of Atka, Alaska 2015-09-04 13:35:37 UTC depth= 46.4km
  • M4.8, 111km SSW of Atka, Alaska 2015-09-04 12:48:55 UTC depth= 36.3km
  • M4.9, 81km SW of Atka, Alaska 2015-09-04 12:42:06 UTC depth= 42.1km
  • M4.8, 98km SW of Atka, Alaska 2015-09-04 12:24:24 UTC depth= 46.4km
  • M4.8, 105km SSW of Atka, Alaska 2015-09-04 12:15:42 UTC depth= 29.3km

Other Significant Earthquakes

  • M5.4, 15km SSE of Oguz, Azerbaijan 2015-09-04 04:49:38 UTC depth= 13.8km
  • M5.5, 142km NE of Naze, Japan 2015-09-04 04:49:21 UTC depth= 10.0km
  • M5.4, 224km E of Namie, Japan 2015-09-03 16:51:47 UTC depth=10.0km

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Significant Aftershocks Follow Powerful Japan Quake

Posted by feww on October 26, 2013

Quake magnitude revised down to 7.1Mw, as significant aftershocks strike

Magnitude of the powerful earthquake that struck off Fukushima coast has been revised down to 7.1Mw by USGS/EHP.

The revised details are as follows

  • Magnitude: 7.1Mw
  • Time: 2013-10-26 02:10:16 UTC+09:00
  • Location: 37.170°N, 144.665°E [475km (295mi) ENE of Tokyo, Japan]
  • Depth: 10.0km

At least 4 significant aftershocks have occurred, as of posting, the largest of which measured 5.5Mw.

Meantime, the authorities evacuated the crippled Fukushima Power Plant, after Tsunami Advisories were issued.

The plant operator said on Saturday there was no damage or change in radiation levels at the station following the quake, according to reports.

A 30cm tsunami reached Japan’s east coast, NHK reported.

The quake reportedly shook buildings far away as Tokyo, about 230 km south of Fukushima nuclear plant, and 475km WSW of the epicenter.

Earthquake Location Map

japan quake aftershocks 26oct13
Source: USGS/EHP

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M 7.3 Quake Strikes Off the Pacific Coast of Japan

Posted by feww on October 25, 2013

Powerful Quake Strikes at a depth of about 10 km

Local Tsunami Advisories have been issued for

  • KUJUKURI and SOTOBO areas, CHIBA Prefecture.

The event occurred near Bosei Seamount, east of Japan Trench and about  240km southeast (121 degrees) ESE of the 2011 Tōhoku earthquake.

Time: 2013-10-26 02:10:16 UTC+09:00
Location: 37.194°N 144.663°E
Depth: 10.0km

Earthquake Location Map

M 7.3 Honshu 26oct13
Source: USGS/EHP

Tsunami Map

tsunami map
Map shows the locations where Tsunami Advisories (local Tsunamis measuring 0.2 – 1.0 m high) have been issued. Source: JMA

More Details to follow…

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Japan Mega Quake Warning

Posted by feww on July 10, 2011

Mega Quake Measuring about 9.6Mw Could Strike Near Fukushima, Japan: FIRE-EARTH

FIRE-EARTH Models show that a large earthquake measuring up to 9.6Mw could strike within a 130 km coast of Fukushima, Japan.

Forecast Details:

  • Magnitude: Up to 9.6Mw 
  • Estimated Depth: 15km (±5km)
  • Location: Epicentered near 37.63ºN, 142.45ºE
  • Position: 130km east of Minamisōma, Fukushima, Japan
  • Expected Time of occurrence: July – October 2011
  • Probability of Occurrence: 72%

Global Tectonics Alert – April 9

JPTRMT1 – FIRE-EARTH estimates that about 80 exajoules (EJ) of tectonic stress energy could be accumulated in Japan Region between now and early 2016.

FIRE-EARTH Models show that most of the energy would be released as large earthquakes including a massive shock, a Megathrust earthquake, the largest on record, measuring 10.0+Mw, which could release about 64EJ of energy.

[NOTE: The 1960 Valdivia earthquake—The Great Chilean Earthquake—is the largest ever recorded earthquake measuring 9.5Mw. The quake struck on May 22, 1960 at 38.29ºS, 73.0ºW. Seismic moment release: ~ 11.3 EJ]

Previous Forecasts

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Japan Quake: Strong Shock Rattles Next Target Area

Posted by feww on April 22, 2011

M6.2 Quake Strikes 16 km East of Chiba

Strong Quakes Rattles Large Areas East of Tokyo, Japan

The strong quake, epicentered  at 140.39°E,  35.53°N struck at a depth of 28km at 13:37:02 UTC on April 21, GFZ Potsdam reported.

The quake was followed by a number of aftershocks, the largest of which measured 5.6Mw.

FIRE-EARTH forecast: The mean distance of epicenters for significant shocks striking near Boso Triple Junction (Sagami Trough), on the east coast of Honshu, are moving closer to Tokyo area, making Chiba City a highly probable target for a large quake (Magnitude > 8.4Mw).

NGDC/NOAA map of Japan Trench, with the broader location of Boso Triple Junction marked. Map enhanced by FIRE-EARTH.


Earthquake Map

Quake Details

Region: Near East Coast of Honshu, Japan
Magnitude: 6.2Mw
Time:     2011-04-21 13:37:01.9 UTC
Epicenter:     140.39°E, 35.53°N
Depth:     28 km
Source: GFZ Potsdam – Earthquake Bulletin

Japan Meteorological Agency reported the quake as a 6.0Mw, while USGS recorded a 6.1Mw shock. NO tsunami warning/advisory was issued.

Distances [USGS]

  • 64 km (39 miles) E of TOKYO, Japan
  • 76 km (47 miles) ENE of Yokohama, Honshu, Japan
  • 82 km (50 miles) S of Mito, Honshu, Japan
  • 115 km (71 miles) SSE of Utsunomiya, Honshu, Japan

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