There an underwater mountain, or seamount, is moving under the tectonic plate.
From the sciencedaily.com
Which process formed the seamount has a profound effect on its eruptive materials.
From the en.wikipedia.org
An earthquake swarm in 1995 may have been related to an eruption from the seamount.
From the en.wikipedia.org
The Gorringe seamount is located about 250km south-west of Cape San Vicente.
From the guardian.co.uk
The Bowie Seamount is also the youngest seamount in the Kodiak-Bowie Seamount chain.
From the en.wikipedia.org
A seamount 4600 metres high was found during a survey of the Indian Ocean.
From the newscientist.com
The Pacific Ocean contains several long seamount chains, formed by hotspot volcanism.
From the en.wikipedia.org
The contrast between the seamount and the surrounding area was well-marked.
From the en.wikipedia.org
An elevation image of the Brothers seamount chain, northeast of New Zealand's mainland.
From the sciencedaily.com
More examples
An underwater mountain rising above the ocean floor
A seamount is a mountain rising from the ocean seafloor that does not reach to the water's surface (sea level), and thus is not an island. These are typically formed from extinct volcanoes, that rise abruptly and are usually found rising from a seafloor of depth. ...
(Seamounts) A submerged and isolated elevation on the deep-sea floor, representing volcanic eruption. A seamount is an elevation of the sea floor, either flat topped (called guyot) or peaked (called seapeak). Seamounts stand over 500 fathoms (some 1000 m) above the surrounding sea floor. ...
(Seamounts) Active or extinct underwater volcanoes rising at least 3,300 ft above the seafloor. Those that penetrate the surface become islands, such as the Hawaiian Islands .
(Seamounts) Individual peaks of seafloor topography that rise more than 1,000 m above the ocean floor.*
An isolated, steep-sided, peak on the seafloor usually caused by volcanic activity. Generally, seamounts rise at least 1000m, though biologists often include shorter submarine peaks.
A submarine mountain rising 1,000 meters or more above the sea floor.
An isolated tall mountain on the sea floor that may extend more than 1 kilometer from base to peak (see also Guyot).
An undersea mountain rising prominently above the seafloor but having its summit well below the surface of the water; also known as tablemount. [nb: not tableland]