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A two-dimensional lithospheric magnetic anomaly field model of Egypt using the measurements from swarm satellites

Geodesy and Geodynamics 2021年第3期12卷 229-238页

作者： Adel Fathy Essam Ghamry Physics Department Faculty of ScienceFayoum UniversityEgypt National Research Institute of Astronomy and Geophysics 11421HelwanCairoEgypt

We use magnetic field data observed by the swarm mission from 2014 to 2020 to construct,for the first time,a two-dimensional(2 D)lithospheric magnetic anomaly model of Egypt and its surrounding *** data during quiet geomagnetic conditions has been expanded in terms of the Legendre polynomial in harmonic terms N=*** damped least square method has been used to estimate the model coefficients based on the lithospheric magnetic *** data at two different altitudes(438-448 km and 503-511 km)were compared with the CHAOS *** exhibit that the 2 D model is superior to the CHAOS model in the capability of extracting more information about small-scale crustal anomaly *** low altitudes(438-448 km),the strength of the anomaly field increases,but the noise of the external fields has greatly reduced at high altitudes(503-511 km).Besides,the magnetic anomaly field at low altitudes has illuminated short-scale anomalies that didn’t appear at high *** the total and vertical magnetic anomaly vectors showed their ability to reveal tectonic structures compared with Moho depth map and the geological maps.

关键词： Damped inverse theory swarm satellites Lithospheric magnetic anomaly field Legendre polynomial Egypt

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Automatic Anomaly Detection for swarm Observations

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Journal of Geodesy and Geoinformation Science 2021年第1期4卷 94-108页

作者： Yaxin BI Vyron CHRISTODOULOU George WILKIE Guoze ZHAO Peter NICHOLL Mingjun HUANG Bin HAN Ji TANG School of Computing Faculty of ComputingEngineering and the Built EnvironmentUlster UniversityNewtownabbeyBT367UK School of Architecture and the Built Environment Ulster UniversityNewtownabbeyBT367UK Institute of Geology China Earthquake AdministrationBeijing 100029China

The swarm satellite mission was launched on 22 November 2013,it is the first European Space Agency’s constellation of three satellites,dedicated to monitoring geomagnetic field *** measurements delivered by the three satellites are very valuable for a range of applications,including the earthquake prediction ***,for more than 5 years,relatively little advancement has been achieved in establishing a systematic approach for detecting anomalies from the satellite measurements for predicting *** paper presents the challenges of developing a pragmatic framework for automatic anomaly detection and highlights innovative features of functional components *** a case study we demonstrate a functionality pipeline of the system in detecting anomalies,and present our solutions to coping with data sparsity and parameter tuning as well as insights into the differences between discovering seismic anomalies from periodic and non-periodic data observed by the swarm satellites.

关键词： anomaly detection swarm satellites earthquake prediction study

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