Airborne Gravimetry Measurements over Baikal

IF 0.7 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Doklady Earth Sciences Pub Date : 2024-09-04 DOI:10.1134/s1028334x2460347x

V. N. Koneshov, P. S. Mikhailov

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Abstract

The results of the first high-precision airborne gravimetric route survey, which was conducted in 2023 along a transverse profile of Lake Baikal at a flight altitude of 5300 m, are presented. The use of an airborne gravimetric complex based on the AN-26BRL aircraft–laboratory is described. Directly over the lake, the largest negative measured anomaly of the gravity field was –180.8 mGal and the horizontal gradient of the field measurement was up to 9 and 5 mGal/km for the western and eastern shores of Lake Baikal, respectively. The internal convergence of anomaly values along the route profile for a complex of three gravimeters was 0.74 mGal. The estimations of the resolution and reliability of most topical current global models of the Earth’s gravity field (UGM-SGG-2, EGM2008, XGM2019, and Sandwell and Smith v32) based on satellite data are assessed for the Baikal rift basin. It is shown that the mean square deviations of the field along the entire profile between the values calculated from satellite models with a number of spherical harmonic coefficients of ≥2190 and the airborne gravimetric observations are 9.5‒17.9 mGal, whereas the maximum deviations at individual points of the route are 40–80 mGal. The comparison with data on the marine gravimetric survey on a scale of 1 : 500 000 is carried out using airborne profile data. Due to the highly detailed data along the airborne gravimetry profile, it is established that the factual value of the main negative anomaly on the air profile is higher than that accepted for the analysis and complex interpretation of geophysical data in the area of Lake Baikal.

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贝加尔湖上空的机载重力测量数据

摘要介绍了 2023 年在飞行高度 5300 米处沿贝加尔湖横向剖面进行的首次高精度机载重力路线勘测的结果。介绍了以 AN-26BRL 飞机实验室为基础的机载重力测量综合装置的使用情况。在贝加尔湖正上方测得的重力场最大负异常值为 -180.8 mGal，在贝加尔湖西岸和东岸测得的重力场水平梯度分别为 9 mGal/km 和 5 mGal/km。在贝加尔湖裂谷盆地，对基于卫星数据的当前最热门的地球重力场全球模型（UGM-SGG-2、EGM2008、XGM2019 和 Sandwell and Smith v32）的分辨率和可靠性进行了评估。结果表明，根据球谐波系数数≥2190 的卫星模型计算得出的数值与机载重力观测数据之间沿整个剖面的场均方差为 9.5-17.9 mGal，而沿线个别点的最大偏差为 40-80 mGal。由于机载重力剖面数据非常详细，因此可以确定机载剖面主要负异常的实际值高于贝加尔湖地区地球物理数据分析和复杂解释所接受的值。

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来源期刊

Doklady Earth Sciences 地学-地球科学综合

CiteScore

1.40

自引率

22.20%

发文量

138

审稿时长

3-6 weeks

期刊介绍： Doklady Earth Sciences is a journal that publishes new research in Earth science of great significance. Initially the journal was a forum of the Russian Academy of Science and published only best contributions from Russia. Now the journal welcomes submissions from any country in the English or Russian language. Every manuscript must be recommended by Russian or foreign members of the Russian Academy of Sciences.