DB/T 94-2024 in English

VALID

Report writing specifieations for the field verification of observed seismieanomaly-Geoelectricity

Issued on:2024-03-01
Implemented on:2024-09-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $250.00
$243.00

Standard No:	DB/T 94-2024
Document status:	VALID
Title in English:	Report writing specifieations for the field verification of observed seismieanomaly-Geoelectricity
Title in Chinese:	地震观测异常现场核实报告编写地电
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2024-03-01
Implemented on:	2024-09-01
ICS Classification:	91.120.25-Seismic and vibration protection
Chinese Classification:	P15-Engineering seismic resistance
Professional Classification:	DB-Provincial Standard
Related Keywords:	field verification field work electric field regional geoelectric field observation network comparative observation timeliness guarantee measures field work
Related Topics:	Abnormal EMG Remote group abnormal band Local level inspection report Field observation report Modern Observation Network Abnormal current motor On-site inspection report write abnormal karyotype Abnormal photocurrent test Seismic wave field Seismic wave field Test experiment report Field Installation Report Abnormal electrophoresis Field observation report Abnormality of sliding resistor Cabinet earthquake resistance test report Transmission electron microscope experiment report Quantitative determination of nucleic acids experimental report Methodological experimental anomalies nuclear power foundation

本文件规定了地震地电观测异常现场核实报告的基本要求、资料收集与分析的主要内容以及编排格式。
本文件适用于地震地电观测异常现场核实报告的编写。

Introduction

Standard Framework and Technological Evolution

Version	Core Changes	Technological Breakthroughs
DB/T 70-2018	Establishing the Standard for Underground Fluid Observation for the First Time	Introducing Multi-parameter Joint Analysis
DB/T 94-2024	Refining the Abnormal Handling Process of Geoelectric Observation	Adding Quantitative Analysis of Electric Field Perturbation

Key Terms Analysis

Earth resistivity influence coefficient: a weight parameter that characterizes the relationship between the true resistivity change of the medium and the observed value, and the calculation formula is k=Δρ_observation/Δρ_{true value}. Case: k=0.78 was measured in the data calibration of Tianshui Station in Gansu in 2019.

Electrode distribution area: a circular monitoring area with the midpoint of the electrode distance as the center and the radius calculated according to earth resistivity(3L/5), electric field disturbance(3L/5), and earth electric field(2L/3).

Four-step process for abnormality verification

System detection: including 12 indicators such as electrode grounding resistance (required ≤50Ω), line insulation (≥10MΩ)
Environmental investigation: identify interference sources such as high-voltage lines and pumping wells within a radius of 3L
Data analysis: use convolution filtering to eliminate precipitation interference, and use numerical simulation to calculate the impact of leakage
Anomaly determination: classified by confidence level (A/B/C) and prediction period (background/medium-term/short-term/imminent earthquake)

Implementation suggestions

Typical problem handling solutions

Synchronicity anomaly: it is recommended to establish a regional geoelectric field observation network for cross-validation
Frozen soil interference: Use electrode heating device to maintain constant temperature observation in winter
Data in doubt: Start the backup measuring electrode for 72 hours of comparative observation

Timeliness guarantee measures

Field work must be started within 72 hours after the abnormality is discovered, and the report should be completed and filed within 5 working days after the completion of the field work.

More samples: GB 18306-2015 DL/T 368-2010 DL/T 5154-2012

Sample only — not a preview of DB/T 94-2024