A new approach to geophysical real-time measurements on a deep-sea floor using decommissioned submarine cablesReport as inadecuate




A new approach to geophysical real-time measurements on a deep-sea floor using decommissioned submarine cables - Download this document for free, or read online. Document in PDF available to download.

Earth, Planets and Space

, Volume 50, Issue 11–12, pp 913–925

First Online: 06 June 2014Received: 08 April 1998Revised: 16 October 1998Accepted: 17 October 1998

Abstract

In order to better understand earthquake generation, tectonics at plate boundaries, and better image the Earth’s deep structures, real-time geophysical measurements in the ocean are required.
We therefore attempted to use decommissioned submarine cables, TPC-1 and TPC-2.
An OBS was successfully linked to the TPC-1 on the landward slope of the Izu-Bonin Trench in 1997.
The OBS detected co-seismic and gradual changes during a Mw 6.1 earthquake just below the station at 80 km depth on November 11, 1997.
A pressure sensor co-registered a change equivalent to 50 cm sea-level change.
This suggests a high possibility detecting silent earthquakes or earthquake precursors if they exist.

A multi-disciplinary geophysical station has been developed for deep-sea floor using TPC-2 since 1995.
The station comprises eight instrument sets: broadband seismometers, geodetic measurements, hydrophone array, deep-sea digital camera, CTD, etc.

These activities are examples that decommissioned submarine cables can be great global resources for real-time cost-effective geophysical measurements on a deep-sea floor.

Download to read the full article text



Author: Junzo Kasahara - Toshinori Sato - Hiroyasu Momma - Yuichi Shirasaki

Source: https://link.springer.com/



DOWNLOAD PDF




Related documents