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GEOPHYSICAL SYSTEM OF PERMANENT INSTALLATION FOR UNDERWATER MONITORING OF SEISMIC EVENTS
Abstract
The area of underwater seismic and geophysical exploration is now rapidly growing with increasing complexity of the employed equipment. At present, more reliable data are gathered by Ocean Bottom Seismometers - autonomous instruments used in long duration seismic surveys. The general idea behind this equipment is that autonomous devices are unable to transmit data in real-time and require offshore operations for periodical deployment. However, the task of a permanent underwater monitoring for seismic events with online data acquisition is largely needed as more people live and more infrastructure is located in coastal areas. Systems for permanent seismic monitoring - tsunami early warning or alike require online data transmission of underwater seismic events from the observation points located several kilometers from the coast. This task requires introduction of modern optical technologies to transfer the power from the shore to the instrument and to retrieve the acquired data in backward direction. The equipment described in the study represents the achievement of joint application of electrochemical sensors (hydrophone and geophones) with cutting-edge optical technologies for synchronization, data and power transmission. The advantages of molecular-electronics electrochemical sensors are extremely high sensitivity, wide dynamic and frequency range especially at lower frequencies. The active geophones and the hydrophone employed in the system have an increased stability and show a low level of self-noise. As a result, a higher resolution and an increased range of the underwater events that can be registered are achieved. The prototype of the seismic-acoustic complex presented in the study includes: a three-component active molecular-electronic geophone for recording the seismic field and an experimental high-stability active molecular-electronic hydrophone for measuring the acoustic environment, as well as a fiber-optic (copper-free) underwater cable system for operating the four channel real-time data acquisition module. Brief description of the study and used methods. Brief description of the study and used methods. Brief description of the study and used methods. Brief description of the study and used methods. Brief description of the study and used methods.
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References15
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