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Distance Measurements by Taping01:18

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Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...
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Updated: Jan 13, 2026

Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt
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Robust Phase Association and Simultaneous Arrival Picking for Downhole Microseismic Data Using Constrained Dynamic

Tuo Wang1, Limin Li2, Shanshi Wen3

  • 1State Key Laboratory of Lithospheric Evolution and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China.

Sensors (Basel, Switzerland)
|January 10, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a new multi-channel arrival picking framework using Constrained Dynamic Time Warping (CDTW) for improved microseismic event analysis. The method enhances phase identification and arrival time accuracy, even with complex downhole wavefields.

Keywords:
arrival pickingdownhole arraydynamic time warpingmicroseismic monitoringphase association

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Area of Science:

  • Geophysics
  • Seismology
  • Petroleum Engineering

Background:

  • Accurate microseismic phase association and arrival time picking are crucial for event location and source characterization.
  • Downhole microseismic wavefields present challenges due to subsurface heterogeneity, complex propagation paths, and ambient noise, impacting conventional picking methods.
  • P-wave coda energy and shear wave splitting can obscure S-wave onsets and create ambiguous arrivals, complicating analysis.

Purpose of the Study:

  • To develop a novel multi-channel arrival picking framework for enhanced phase identification and simultaneous P- and S-wave arrival estimation in microseismic data.
  • To address the limitations of conventional methods in handling complex downhole wavefields and improve the accuracy of microseismic event analysis.

Main Methods:

  • Proposed a novel multi-channel arrival picking framework based on Constrained Dynamic Time Warping (CDTW).
  • Introduced a Multivariate CDTW approach to jointly process three-component (3C) data, ensuring inter-component and inter-receiver arrival consistency.
  • Validated the CDTW method against Short-Term Average/Long-Term Average (STA/LTA) and waveform cross-correlation techniques using field data.

Main Results:

  • The proposed CDTW algorithm significantly enhances arrival time accuracy and inter-receiver consistency.
  • Demonstrated superior performance in scenarios with P-wave coda interference and shear wave splitting.
  • Achieved more reliable phase identification and simultaneous P- and S-wave arrival estimation compared to conventional methods.

Conclusions:

  • The novel multi-channel CDTW framework provides a robust solution for accurate microseismic phase picking in challenging downhole environments.
  • The method improves the reliability of microseismic event location and source characterization by overcoming limitations of existing techniques.
  • This advancement is particularly beneficial for analyzing microseismic data from hydraulic fracturing operations in shale gas reservoirs.