Definition The Birma Seamount is a submarine mountain (seamount) located in the northeastern Indian Ocean, specifically within the Andaman Sea. It is an isolated topographical high rising significantly from the surrounding abyssal plain.
Overview Situated to the west of the Andaman Islands, the Birma Seamount is a prominent geological feature in a tectonically active region. It is recognized as an extinct or dormant submarine volcano and forms part of the complex bathymetry of the Andaman Back-Arc Basin. Seamounts like Birma often create unique deep-sea ecosystems, acting as biodiversity hotspots due to their interaction with ocean currents, providing hard substrates for sessile organisms, and potentially concentrating nutrients and plankton. As such, it is a site of interest for marine geological and biological research.
Etymology/Origin The name "Birma" is an older geographical designation for Myanmar (Burma), reflecting the seamount's location in the vicinity of the region historically associated with Burma, within the Andaman Sea. The seamount's formation is attributed to the complex subduction processes occurring along the Sunda Arc, where the Indian Plate subducts beneath the Burma Microplate.
Characteristics
- Geographical Location: The Birma Seamount is located in the Andaman Sea, approximately west of the Middle Andaman Island. Its approximate coordinates are around 12°N latitude and 93°E longitude.
- Geology and Bathymetry: It is a conical seamount with a broad base, rising from the seafloor, which can be several thousand meters deep, to a peak that typically lies between 400 and 500 meters below sea level. It is considered to be of volcanic origin, representing an ancient or inactive submarine volcano associated with the extensional tectonics and back-arc spreading in the Andaman Basin.
- Oceanography and Biology: The presence of the seamount influences local ocean currents, potentially creating upwelling zones that bring nutrient-rich waters to shallower depths. This, coupled with the varied topography, supports diverse marine life, including deep-sea corals, sponges, various invertebrates, and fish species. The distinct habitats provided by the seamount contrast sharply with the surrounding soft-sediment abyssal plains.
Related Topics
- Andaman Sea
- Andaman-Nicobar Arc
- Seamount
- Deep-sea ecosystems
- Marine geology
- Plate tectonics
- Submarine volcanism