Wudalianchi consists of volcanoes formed in late Quaternary multiple eruption. For the purpose of selecting site for hot dry rock exploration and development,a new round of geophysical exploration was launched. Based on complete magnetic survey data ob-tained in Wudalianchi in recent years,in combination of magnetotelluric surveying and seismic tomography results,the authors re-un-derstood and explained the existing magnetic exploration data. By a comparison with gravity and magnetic field,the authors emphatical-ly investigated Weishan central type eruption formation volcanic dome structure,magmatic sac dynamic mechanism and geological back-ground reflected by gravity and magnetic field, whose characteristics are different from features of Bijiashan-Laoheishan fissure erup-tions. Therefore,the results obtained by the authors can provide geophysical information and evidence for studying and discussing the existence of hot dry rock in the deep part of Wudalianchi volcanic edifice.%五大连池是第四纪形成后期经多次喷发形成的火山群,为干热岩勘查开发选址,开展了新一轮地球物理勘查,笔者在五大连池近年完成的重磁勘查资料基础上,结合大地电磁探测和地震层析成像的成果,对已有重磁勘查资料重新认识再解释.通过重磁场对比,着重探讨了重磁场反映的尾山中心式喷发形成火山穹窿构造、岩浆囊的动力机制和地质背景,有别于笔架山—老黑山裂隙式喷发的特征,据此,可为五大连池火山机构研究和探讨深部存在干热岩提供地球物理信息和依据.
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