地震学报
地震學報
지진학보
Acta Seismologica Sinica
2015年
6期
997-1010
,共14页
冯丽丽%王粲%陈斌%袁洁浩
馮麗麗%王粲%陳斌%袁潔浩
풍려려%왕찬%진빈%원길호
地壳磁异常%岩石圈磁场%CGRF2010%EMM2010%MF6
地殼磁異常%巖石圈磁場%CGRF2010%EMM2010%MF6
지각자이상%암석권자장%CGRF2010%EMM2010%MF6
crustal magnetic anomaly%lithospheric magnetic field%CGRF2010%EMM2010%MF6
利用地磁场全球模型 MF6,EMM2010和基于地面观测数据建立的2010.0中国地磁参考场(CGRF2010)等3个模型分别计算了中国大陆地区岩石圈磁场,发现3个模型各有其特点:基于卫星数据建立的 MF6模型分辨率有限,其磁异常条带呈蠕虫状;EMM2010模型岩石圈磁场概貌与 MF6模型相似但细节特征十分突出;CGRF2010模型可信度较高,其分辨率东西部差异较大,异常形态以团状为主.通过分析3个模型得到的中国大陆地区岩石圈磁场垂直分量ΔZ 的强度及其分布特征发现:ΔZ 分量在准噶尔盆地、塔里木盆地、柴达木盆地及四川盆地等地区均为正值,而在天山、大巴山等地区为负值;ΔZ 分量分布在华北岩石圈地块与华南岩石圈地块吻合程度较高;在青藏高原南部、西域岩石圈地块北部以及松辽岩石圈地块,全球模型与 CGRF2010模型存在显著差别.
利用地磁場全毬模型 MF6,EMM2010和基于地麵觀測數據建立的2010.0中國地磁參攷場(CGRF2010)等3箇模型分彆計算瞭中國大陸地區巖石圈磁場,髮現3箇模型各有其特點:基于衛星數據建立的 MF6模型分辨率有限,其磁異常條帶呈蠕蟲狀;EMM2010模型巖石圈磁場概貌與 MF6模型相似但細節特徵十分突齣;CGRF2010模型可信度較高,其分辨率東西部差異較大,異常形態以糰狀為主.通過分析3箇模型得到的中國大陸地區巖石圈磁場垂直分量ΔZ 的彊度及其分佈特徵髮現:ΔZ 分量在準噶爾盆地、塔裏木盆地、柴達木盆地及四川盆地等地區均為正值,而在天山、大巴山等地區為負值;ΔZ 分量分佈在華北巖石圈地塊與華南巖石圈地塊吻閤程度較高;在青藏高原南部、西域巖石圈地塊北部以及鬆遼巖石圈地塊,全毬模型與 CGRF2010模型存在顯著差彆.
이용지자장전구모형 MF6,EMM2010화기우지면관측수거건립적2010.0중국지자삼고장(CGRF2010)등3개모형분별계산료중국대륙지구암석권자장,발현3개모형각유기특점:기우위성수거건립적 MF6모형분변솔유한,기자이상조대정연충상;EMM2010모형암석권자장개모여 MF6모형상사단세절특정십분돌출;CGRF2010모형가신도교고,기분변솔동서부차이교대,이상형태이단상위주.통과분석3개모형득도적중국대륙지구암석권자장수직분량ΔZ 적강도급기분포특정발현:ΔZ 분량재준갈이분지、탑리목분지、시체목분지급사천분지등지구균위정치,이재천산、대파산등지구위부치;ΔZ 분량분포재화북암석권지괴여화남암석권지괴문합정도교고;재청장고원남부、서역암석권지괴북부이급송료암석권지괴,전구모형여 CGRF2010모형존재현저차별.
The 2010.0 Epoch China Geomagnetic Map and its related models based on ground observation could describe the lithospheric magnetic field of Chinese mainland (refer to as Chinese geomagnetic reference field on 2010 epoch,CGRF2010 for short).We can also use global geomagnetic models, MF6 and EMM2010 for example,to calculate the lithospheric magnetic field of Chinese mainland.Based on the three models,the lithospheric magnetic fields of Chinese mainland were calculated in this paper.Each of them has its own characteristics.MF6 model,which was based on satellite data,has limited res-olution and wormlike magnetic anomaly stripes.The model EMM2010 has a very similar overview general picture with the model MF6 but has a lot more details.The model CGRF2010,which has many clustery anomalous areas,is highly reliable,although the resolution of the model is quite different from east to west.The analyses on the vertical component ΔZ of lithospheric magnetic field and its distribution characteristics indicate that the three model-based ΔZ are consistently positive at Junggar,Tarim,Qaidam and Sichuan basin and negative at Tianshan and Dabashan.The ΔZ component distribution of the three models at North China lithospheric block agrees well with that at South China lithospheric block.However,ΔZ component based on global geomagnetic models is notably different from that based on the model CGRF2010 at southern Qinghai-Xizang (Tibet)Plateau,northern Xiyu lithospheric block and whole Songliao lithospheric block.