AH0J(Mariana Islands) on 40m LSB!!!

AH0J(Mariana Islands) on 40m LSB!!!

AH0J  Mariana Islands KATSUMI YOSHINUMA PO BOX 502571 SAN JOSE, MP 96950 USA [+] Mailing label
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20121129 2015UTC 7145kHz AH0J
Date : 29/Nov/2012 2015UTC 
Freq : 7145kHz LSB 
Rig : KENWOOD TS-870S
ANT : LOOP(for 20m not enough gain) 
PC recording

The Mariana Islands (also the Marianas; up to the early 20th century sometimes called Ladrones Islands, from Spanish Islas de los Ladrones meaning "Islands of Thieves") are an arc-shaped archipelagomade up by the summits of fifteen volcanic mountains in the north-western Pacific Ocean between the12th and 21st parallels north and along the 145th meridian east. They are south of Japan and north of New Guinea, and form the eastern limit of the Philippine Sea. The islands were named after Spanish QueenMariana of Austria in the 17th century, when Spain started the colonization of the archipelago. They form the northern part of the western Pacific subregion of Micronesia, and are composed of two U.S. jurisdictions: the Commonwealth of the Northern Mariana Islands and, at the southern end of the chain of islands, the territory of Guam.

The islands are part of a geologic structure known as the Izu-Bonin-Mariana Arc system, and range in age from 5 million years old in the north to 30 million years old in the south (Guam). The island chain arises as a result of the western edge of the Pacific Plate moving westward and plunging downward below theMariana plate, a region which is the most volcanically active convergent plate boundary on Earth. Thissubduction region, just east of the island chain, forms the noted Mariana Trench, the deepest part of the Earth's oceans and lowest part of Earth's crust. In this region, according to geologic theory, water trapped in the extensive faulting of the Pacific Plate as serpentinite, is heated by the higher temperatures of depth during its subduction, and the pressure from the expanding steam results in the hydrothermal activity in the area, and the volcanic activity which formed the Mariana Islands.^[1]