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Seismic activity recorded by a single OBS/H near the active Longqi hydrothermal vent at the ultraslow spreading Southwest Indian Ridge (49°39′ E)
- Source :
- Marine Georesources & Geotechnology. 37:201-211
- Publication Year :
- 2018
- Publisher :
- Informa UK Limited, 2018.
-
Abstract
- In this paper, we describe the results of a first pilot experiment of passive seismic monitoring near the active Longqi hydrothermal vent at the Southwest Indian Ridge during Chinese cruise DY115-30. During 102-day experiment, we recorded over 2,000 seismic events on a single ocean bottom seismometer with hydrophone close to the hydrothermal field. We classified these events into the following three classes based on their time–frequency characteristics: (1) volcano tectonic microearthquakes (VTMs); (2) regional earthquakes; (3) short-duration events (SDEs). We preliminarily located the 1,277 VTMs using a singlestation location method. Our results revealed hypocenters primarily beneath the axial valley ridge which is about 10 km away from hydrothermal vent and extending to the upper mantle at a depth of 15 km. Two discrete swarms of VTMs occurred during our survey period. The SDEs show a complex frequency characteristics ascribed to clusters of monochromatic waves around different frequencies. This suggests that SDEs result from combination of harmonic waves resonating in fluid-filled pipes and cracks.
- Subjects :
- geography
geography.geographical_feature_category
Hydrophone
010505 oceanography
0211 other engineering and technologies
Ocean Engineering
02 engineering and technology
Geotechnical Engineering and Engineering Geology
Oceanography
01 natural sciences
Hydrothermal circulation
Tectonics
Volcano
13. Climate action
Ridge
Passive seismic
14. Life underwater
Microearthquake
Geology
Seismology
021101 geological & geomatics engineering
0105 earth and related environmental sciences
Hydrothermal vent
Subjects
Details
- ISSN :
- 15210618 and 1064119X
- Volume :
- 37
- Database :
- OpenAIRE
- Journal :
- Marine Georesources & Geotechnology
- Accession number :
- edsair.doi...........ba0b6e73c6fc43cf51478558b3396815