Posted by feww on June 1, 2010
Submarine Volcano Erupts Near Sarigan Island
An underwater volcano off Sarigan Island, Northern Marianas, about 160km (100 miles) north of the island of Saipan erupted on Saturday sending a plume of steam and ash cloud into the air and showering the ocean surface with volcanic debris, US officials reported on Monday.
“An EMO observer aboard an overflight yesterday reported a large area of debris floating in the sea south of the island, and a stationary area of discoloration in the water, presumably above the vent. The crew on Sarigan reported passage of a small wave (less than 0.5 m) following onset of the eruption yesterday.” USGS said.
However, satellite images show no sign of ongoing activity, USGS said.
“Seismicity at a single nearby station on Sarigan Island declined soon after the eruption of a large steam and ash cloud from a submarine vent 11 km (7 miles) south of Sarigan Volcano early yesterday. Satellite images show no sign of ongoing activity.”
Scientists had initially thought the volcanic cloud came from either of the Anatahan or Sarigan volcano, and later verified the source by the trail of debris and water discoloration close to the vent, a USGS official said.
The Northern Mariana Islands are located about 6100km (3,800 miles) southwest of Hawaii.
Summary of Volcano Details (USGS):
- Volcano Location: N 16 deg 42 min E 145 deg 46 min
- Area: Mariana Islands
- Summit Elevation: 1765 ft (538 m)
- Volcanic Activity Summary: Seismicity and subaqueous eruptive activity have declined at Sarigan Volcano prompting reduction of the Aviation Color Code to YELLOW and the Volcanic Activity Level to ADVISORY.
Major Volcanoes of the Mariana Islands (USGS)
Click image to enlarge.
A M6.4 quake (11.119°N, 93.698°E) which struck close to Barren Island Monday, May 31, 2010 at 19:51:48 UTC, may have triggered the Andaman Sea volcano for eruption.
Posted in US Volcanoes, volcanic activity, volcanic ash, volcanic eruption, volcanic event | Tagged: Anatahan volcano, Barren Island, Saipan, Sarigan Island, Submarine Volcano | 7 Comments »
Posted by feww on February 6, 2010
Fukutokuokanoba submarine volcano erupts
White smoke was observed rising from the sea about five kilometers north-northeast of the Minami-Iwoto island in Ogasawara Islands, a Japanese coast guard patrol vessel reported, Yomiuri Shimbun said.
Smoke believed to be emanating from an underwater volcano was previously detected in the area, about 1,200 kilometers south of central Tokyo, in July 2005.
Tokyo Institute of Technology geoscience Professor, Kenji Nogami, reportedly said: “In the 1986 eruption, a new island appeared after lava accumulated. The island was washed away by waves, but seabed upheaval reduced the water depth to 22 meters in 1999. It’s possible that this [recent] volcanic activity could form a permanent island.”
Location Map, Volcano Islands, Ogasawara Islands, Japan. Image credit: Lim Tor
Bonin Islands (aka, Ogasawara Group, in Japan). Click Image to Enlarge.
The volcano reportedly ejected smoke and ash to a height of about about 100 meters above the sea level. The surrounding sea area was reported as changing to a greenish yellow color with other nearby areas turning cloudy.
Japan’s Meteorological Agency (JMA) said the volcano, called Fukutokuokanoba, has erupted seven times since 1904, forming ephemeral islands (temporary land masses) on three occasions, all of which later sank below the ocean surface.
The first known ephemeral island called Shin-Iwo-jima (New Sulfur Island) was formed in 1904, and the most recent in 1986.
What the Volcano Islands Look Like
North Iwo Jima Island (Official Japanese name Kita-iōtō, but commonly known as Kita-iōjima, meaning “north sulfur island”) is the northernmost island of the Volcano Islands cluster of the Ogasawara Islands, about 1175 km south of Tokyo. Image Credit: Chisatos
Posted in Japan Volcano, New Sulfur Island, Ogasawaramura, Tokyo Prefecture, volcanism | Tagged: Bonin Islands, Fukutokuokanoba, Japan, land mass, Minami-Iwoto, Shin-Iwo-jim, Submarine Volcano, volcanic activity, Volcano Islands | Leave a Comment »