September 19, 2021

Alaska Hit By Earthquake and Tsunami Warning Issued

The USGS is reporting that a magnitude 7.1 earthquake has hit Alaska along the Aleutian Islands chain of islands and lists the exact location as having these coordinates: 51.807°N, 171.477°W.

Tsunami Warning Issued

A tsunami warning has been issued by the NOAA National Weather Service West Coast and Alaska Tsunami Warning Center, which can be found here (PDF).

Alaska Earthquake - Magnitude 7.1

Alaska Earthquake - Magnitude 7.1

Estimated arrival times of the tsunami are listed here(Text File).

This area is very remote and the earthquake hit 125 miles from the nearest populated area, but a tsunami could possibly cause flooding in the area, or in other coastal areas of the Pacific Ocean.

Map of Earthquake Location

View Larger Map

Oil Drilling and Pipeline Damage

There are no reports of any damage to oil or natural gas drilling operations or the Trans-Alaska Pipeline System, but such damage could prove to be a major ecological disaster if the pipeline was ruptured or if a drilling platform was damaged and spilled any oil.

Offshore oil drilling and exploration, as well as in the Arctic National Wildlife Refuge (ANWR), is currently banned under a moratorium, so the potential for an earthquake or tsunami to damage oil and gas production infrastructure is mitigated by this factor, somewhat.

Another Eartquake in Japan, Tsunami Warning

“On Sunday, July 10, 2011, Reuters reports that Japan experienced another aftershock from the deadly March 11th earthquake. The earthquake occurred six miles off of the country’s northeast coast. In response, the Japanese Meteorological Agency issued a tsunami alert for a half-meter tsunami. The U.S. Geological Survey measured the earthquake’s magnitude at 7.0.

Another Eartquake in Japan, Tsunami Warning

Although there were no initial reports of injuries or damage in the region, Tokyo Electric Power evacuated all of its workers at the damaged Fukushima nuclear plant to higher ground.

Relatedly, the Mainichi Daily News reported that a water purification system at the damaged nuclear plant has operated successfully for a week. The system is necessary to cool the plant’s reactors and to remove radioactive water. However, because the system was installed only two months, some officials are worried that it may be vulnerable to damage from aftershocks.”

For more information, click here:

Reuters Article About The Earthquake

Mainichi Daily News Article on the Fukushima Nuclear Plant Repairs

7.4 Magnitude Earthquake ‘Aftershock’ Hits Japan

A magnitude 7.4 ‘aftershock’ earthquake hits Japan on April 7, 2011 and was detected by the USGS and is being widely reported by Japanese and worldwide news media.

Click here for the USGS earthquake report.

Japan Aftershock - Powerful 7.4 Magnitude Earthquake Hits April 7, 2011

A powerful 7.4 magnitude earthquake aftershock hits Japan on April 7, 2011.

While this is a significantly powerful earthquake in its own right, this is considered to be an aftershock of the powerful Japan earthquake that hit the previous month (See this post about the March 11 Earthquake in Japan).

Bloomberg is reporting that there have been no reports to Japanese nuclear plants, but that a tsunami warning has been issued for Japan.  The Pacific Tsunami Warning Center has issued a bulletin on the aftershock but advises that a tsunami is not expected to reach Hawaii.

The Japan Meteorological Agency issued the following info about the earthquake, measuring it at 7.4 magnitude:

******* Earthquake Information ********
Occurred at 23:32 JST 07 Apr 2011
Region name MIYAGI-KEN OKI
Latitude 38.2N
Longitude 142.0E
Depth about 40 km
Magnitude 7.4

The USGS released the following report on the earthquake, measuring it at a 7.1 magnitude:

Magnitude 7.1
Date-Time Thursday, April 07, 2011 at 14:32:41 UTC
Thursday, April 07, 2011 at 11:32:41 PM at epicenter
Time of Earthquake in other Time Zones
Location 38.253¡N, 141.640¡E
Depth 49 km (30.4 miles)
Distances 66 km (41 miles) E ofÊSendai, Honshu, Japan
114 km (70 miles) E ofÊYamagata, Honshu, Japan
116 km (72 miles) ENE ofÊFukushima, Honshu, Japan
330 km (205 miles) NNE ofÊTOKYO, Japan
Location Uncertainty horizontal +/- 13.1 km (8.1 miles); depth +/- 7.2 km (4.5 miles)
Parameters NST=426, Nph=427, Dmin=358.4 km, Rmss=0.75 sec, Gp= 32¡,
M-type=regional moment magnitude (Mw), Version=B
Event ID usc0002ksa

UPDATE – Tsunami warning for Japan has been lifted.