Seismic wave measurement method, aging rate measurement method, program, data processing device, and measurement device

By aligning the oscillator's frequency change with seabed conditions through temperature adjustment and rate measurement, the method corrects internal time accurately, addressing the time drift issue and enhancing seismic wave analysis accuracy for subseafloor geological structures.

WO2026088767A1PCT designated stage Publication Date: 2026-04-30SEISGADGET LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Filing Date
2025-10-07
Publication Date
2026-04-30

AI Technical Summary

Technical Problem

The accuracy of seismic wave analysis for subseafloor geological structures is compromised due to the aging characteristics of crystal oscillators in measurement devices, leading to a time drift between internal and absolute time, which cannot be accurately corrected using aging rates measured in air, as they differ from those at the seabed.

Method used

A method involving temperature determination, reduction, and rate measurement to align the oscillator's frequency change with seabed conditions, followed by internal time correction using the measured aging rate at seabed temperature.

Benefits of technology

This approach enables precise correction of internal time, enhancing the accuracy of seismic wave analysis by accounting for the oscillator's aging rate at seabed temperatures, thereby improving the analysis of subseafloor geological structures.

✦ Generated by Eureka AI based on patent content.

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Abstract

A data processing device 1 includes: a temperature identification unit 181 that identifies the seabed temperature at a position on a seabed where a measurement device is to be installed, the measurement device creating measurement data of seismic waves associated with an internal time at which the seismic waves were detected in response to vibration waves being emitted from a hypocenter; a temperature lowering unit 182 that sets the temperature of an oscillator 41 installed inside the measurement device present at a location other than in seawater to the seabed temperature; a rate measurement unit 183 that measures an aging rate, which is a rate of change over time in the frequency of the oscillator 41, in a state where the temperature of the oscillator 41 installed inside the measurement device present at the location other than in seawater has reached the identified seabed temperature; and a correction unit 188 that corrects the internal time associated with the measurement data on the basis of the aging rate after the measurement device installed on the seabed creates the measurement data.
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Citation Information

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