南迦巴瓦大地电磁测深数据（2020）

本工作的目的为在以往青藏高原东部布设的三维大地电磁测深台阵的基础上，在东构造节附近进行高分辨率的大地电磁测深剖面观测，以揭露区域岩石圈深部结构，了解区域断裂活动性与深部电性构造的关系，并研究印度-欧亚板块碰撞的深部流变学状态。数据集包含青藏高原二次科考《关键地区岩石圈精细结构与浅部响应》专题”南迦巴瓦关键区岩石圈精细结构与浅部响应“任务中的大地电磁测深剖面数据。具体包含从墨脱背崩乡到波密倾多镇约200km的长度范围内，采集的大地电磁测深数据台站数据文件共30个，数据坐标文件1个。数据质量总体良好，有效频率范围约为100Hz-2000s，但受局部干扰影响，有部分台站中频1Hz以后存在不理想的频点；此外，区域地形、覆盖复杂，地下自然电场较强，数据存在着较强的三维畸变效应。

The core objective of this work is to conduct high-resolution magnetotelluric (MT) profiling observations near the Eastern Himalayan Syntaxis, based on the previously deployed 3D magnetotelluric array in the eastern Tibetan Plateau. The specific aims are to reveal the deep structure of the regional lithosphere, clarify the relationship between regional fault activity and deep electrical structures, and investigate the deep rheological state of the India-Eurasia plate collision.

This dataset includes magnetotelluric profiling data from the task "Fine Structure of Lithosphere and Shallow Response in the Namcha Barwa Key Area" under the special topic "Fine Structure of Lithosphere and Shallow Response in Key Areas" of the Second Tibetan Plateau Scientific Expedition and Research (STEP) Program. Specifically, the dataset contains 30 MT station data files and 1 data coordinate file collected along a ~200 km-long profile extending from Beibeng Township, Medog County to Qiangduo Township, Bomi County.

Overall, the data quality is generally favorable, with an effective frequency range of approximately 100 Hz to 2000 s. However, affected by local disturbances, some stations exhibit undesirable frequency points above 1 Hz in the mid-frequency band. Additionally, due to the complex regional topography and surface coverage, as well as strong subsurface natural electric fields, the dataset shows significant 3D distortion effects.

搜集汇总

背景与挑战

背景概述

该数据集是2020年在青藏高原南迦巴瓦关键区采集的大地电磁测深剖面数据，属于第二次青藏高原综合科学考察研究项目的一部分，旨在通过高分辨率观测揭露区域岩石圈精细结构，探究断裂活动性与深部电性构造的关系及印度-欧亚板块碰撞的深部流变学状态。数据集包含约200公里范围内的30个台站数据，数据质量总体良好但受局部干扰和三维畸变效应影响，适用于固体地球科学和大地电磁学研究。