|Posted by George Freund on July 15, 2018 at 1:05 PM|
R/V Petrel was laid up in Singapore for some time. It is at sea again cruising in the Suragao Straight having just left Suragao City, The Philippines. It's destination is Naha, Okinawa. Not only is there a volcano near Suragao City, there are numerous ones in a line between Okinawa and Japan's mainland. There are many wrecks in the Suragao Straight. Pitched naval battles were fought there. R/V Petrel has already explored them.
Volcanoes of Ryukyu Islands (10 volcanoes)
Akuseki-jima, Iriomote-jima, Iwo-Tori-shima, Kikai, Kogaja-jima, Kuchino-shima, Kuchinoerabu-jima, Nakano-shima, Suwanose-jima, Yokoate-jima
Akuseki-jima volcano is a small stratovolcano in the southern Ryukyu Islands, Japan. It forms the island of the same name, which measures 2.5 x 3.2 km in diameter and is surrounded by steep cliffs with beaches present only on the SW and SE sides.
Although no direct date exists, it is plausible that Akuseki-jimais is still active.
Iriomote-jima volcano is a shallow submarine volcano 25 km NNE of the island of the same name.
Iriomote-jima island is the southernmost in the chain of the Ryuku Islands which still belong to Japan. It is located almost 1000 km SSW of Japan's main island Honshu and only 200 km east of Taiwan.
Iwo-Tori-shima volcano (also known as Okinawa-Tori-shima), forms a small 1x2,7 km island located north of the largest island of the Ryukyus, Okinawa.
Records of historical eruptions dating back to 1664 have consisted of mild-to-moderate explosive activity. Iwo-dake, the volcano forming the NW part of the island, has a small lake, solfataras, and sulfur deposits that were mined in the past.
The name part Tori-shima ("Bird Island") is common for small offshore islands in Japan.
Kikai volcano is a 19 km large, mostly submerged caldera at the northern end of the Ryukyu Islands of Japan, located 45 km south of Kuyshu. It is one of the country's most active and most explosive volcanoes.
Tokara-Iwo-Jima (also known as Satsuma-Iwo-jima) is a small 6x3 km wide inhabited island, which has about 140 inhabitants. It is a portion of the NW caldera rim.
Kogaja-jima volcano forms a small island located NW of Nakano-shima, Ryukyu Islands, Japan.
It contains andesitic lava domes and it is not known if the volcano is still to be considered active or not, i.e. if there have been eruptions in the past 10,000 years.
Its name Kogaja-jima means "Little Gaja Island", as it is ESE of the larger Gaja-jima stratovolcano. There is weak fumarolic activity in locations at the coastal cliffs.
Kuchino-shima volcano is one of the active volcanic islands in the northern Ryukyu Islands in southern Japan. The small, 3x7 km wide island is located between the volcanic islands of Nakano-shima and Kuchinoerabu-jima and consists of 2 andesitic stratovolcanoes and a NW-SE-trending chain of lava domes.
There are 2 small villages on the northern end of the island, Nishinohama and Kuchino-shima.
Mae-dake is a lava dome that forms the highest point of the island. The last eruption of the volcano took place about 1200-1300 years ago and was dated by radiocarbon.
Kuchinoerabu-jima (口永良部島 本村西) volcano is one of the active volcanoes of the Ryukyu Island arc, Japan. The 4x12 km wide island is sparsely populated and located 15 km west of Yaku-shima.
All historic activity which consisted in frequent explosions recorded since 1840 took place from Shin-take, but there is a young, but undated lava flow from the south flank of Furu-take that reached the coast.
The largest eruption in historic time occurred in December 1933 and caused damage in several villages located only a few km from the active crater.
Nakano-shima volcano is a stratovolcano forming the 9 x 5 km island of the same name, which belongs to the Ryukyu Island chain in southern Japan.
The island is surrounded by coral reefs, but unlike older extinct ocean islands that sink and form reefs Nakano-shima's volcano is active. There are no known magmatic eruptions in historic times, but a small mud eruption occurred in 1914, and increased "smoking" was seen in 1949.
Suwanose-jima (諏訪之瀬島) volcano is Japan's and one of the world's most active volcanoes. It has been in a state of near-continuous strombolian-type eruption since 1949.
The volcano forms the 8 km long spindle-shaped island of the same name in northern Ryuku Islands, Japan. The remote island is home to about 50 residents only.
Suwanose-jima consists of an andesitic stratovolcano with 2 historically active summit craters. Intermittent to continuous strombolian activity began from On-take (Otake), the NE summit crater, in 1949 and has been going on since. After 1996, occasional periods of inactivity have become more frequent.
Yokoate-jima volcano forms the small, 3.5-km-long island with the same name and is located NW of Amami Oshima Island at the SW end of the Tokara island chain.
The only known historic eruption was in the first half of the 19th century.
The Battle of Okinawa (Japanese: 沖縄戦 Hepburn: Okinawa-sen) (Okinawan: 沖縄戦, translit. Uchinaa ikusa), codenamed Operation Iceberg, was a major battle of the Pacific War fought on the island of Okinawa by United States Marine and Army forces against the Imperial Japanese Army. The initial invasion of Okinawa on April 1, 1945, was the largest amphibious assault in the Pacific Theater of World War II. The 82-day battle lasted from April 1 until June 22, 1945. After a long campaign of island hopping, the Allies were planning to use Okinawa, a large island only 340 mi (550 km) away from mainland Japan, as a base for air operations for the planned invasion of the Japanese home islands.
The United States Navy's Task Force 58, deployed to the east of Okinawa with a picket group of from 6 to 8 destroyers, kept 13 carriers (7 CVs and 6 CVLs) on duty from March 23 to April 27 and a smaller number thereafter. Until April 27, a minimum of 14 and up to 18 escort carriers (CVEs) were in the area at all times. Until April 20, British Task Force 57, with 4 large and 6 escort carriers, remained off the Sakishima Islands to protect the southern flank.
The wreck of the Yamato
There are many shipwrecks in the area for the R/V Petrel to explore. The search may be cover for the reconnaissance of the volcanoes. The great Japanese battleship Yamato was lost in the battle. Her wreck has been discovered and mapped out. It is a shrine to the Japanese. I doubt Petrel will omit diving the wreck. The bottom of the sea is the greatest place to explore or enter the void of the covert operation. There are few observers about.