Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 2 de 2
Filter
Add more filters










Database
Language
Publication year range
1.
J Acoust Soc Am ; 129(3): EL94-9, 2011 Mar.
Article in English | MEDLINE | ID: mdl-21428474

ABSTRACT

An underwater glider with an acoustic data logger flew toward a recently discovered erupting submarine volcano in the northern Lau basin. With the volcano providing a wide-band sound source, recordings from the two-day survey produced a two-dimensional sound level map spanning 1 km (depth) × 40 km(distance). The observed sound field shows depth- and range-dependence, with the first-order spatial pattern being consistent with the predictions of a range-dependent propagation model. The results allow constraining the acoustic source level of the volcanic activity and suggest that the glider provides an effective platform for monitoring natural and anthropogenic ocean sounds.


Subject(s)
Acoustics/instrumentation , Geology/instrumentation , Noise , Signal Processing, Computer-Assisted , Volcanic Eruptions , Water , Equipment Design , Geology/methods , Motion , Oceans and Seas , Sound Spectrography , Time Factors
2.
Nature ; 441(7092): 494-7, 2006 May 25.
Article in English | MEDLINE | ID: mdl-16724063

ABSTRACT

Three-quarters of the Earth's volcanic activity is submarine, located mostly along the mid-ocean ridges, with the remainder along intraoceanic arcs and hotspots at depths varying from greater than 4,000 m to near the sea surface. Most observations and sampling of submarine eruptions have been indirect, made from surface vessels or made after the fact. We describe here direct observations and sampling of an eruption at a submarine arc volcano named NW Rota-1, located 60 km northwest of the island of Rota (Commonwealth of the Northern Mariana Islands). We observed a pulsating plume permeated with droplets of molten sulphur disgorging volcanic ash and lapilli from a 15-m diameter pit in March 2004 and again in October 2005 near the summit of the volcano at a water depth of 555 m (depth in 2004). A turbid layer found on the flanks of the volcano (in 2004) at depths from 700 m to more than 1,400 m was probably formed by mass-wasting events related to the eruption. Long-term eruptive activity has produced an unusual chemical environment and a very unstable benthic habitat exploited by only a few mobile decapod species. Such conditions are perhaps distinctive of active arc and hotspot volcanoes.


Subject(s)
Volcanic Eruptions/statistics & numerical data , Animals , Ecosystem , Geography , Geological Phenomena , Geology , Oceans and Seas , Time Factors
SELECTION OF CITATIONS
SEARCH DETAIL
...