Abstract: The Maanling-Leihuling volcanic cluster in Haikou area is one of the few dormant volcanic clusters in China.In the present study,according to the active stages division,deep magma chamber detection in this area,as well as the investigation of volcano types,scales,material composition and lava cover area,we evaluated the spatial-temporal and intensity features of volcanic activity in this region. Combined with the analysis on the observations of earthquake,geomagnetism,volumetric strain and geothermics in this volcanic region,we made the preliminary assessment on the activity state of deep magma.The results indicate that the last eruption in this Holocene volcano region occurred 4000 a BP,and the future volcanic activity may shift to the epicentre area of the 1605 M7.5 Qiongzhou earthquake in the Hainan Island.

Key words: volcanic activity, magnetotelluric detection, magma chamber, Haikou

摘要： 海口地区的马鞍岭-雷虎岭火山群是中国为数不多的几个休眠火山群之一。通过对区域火山活动期次划分、深部岩浆囊探测以及对火山类型、规模、物质组成和溶岩覆盖面积的分析,总结了海口地区火山活动的时、空、强特征。结合对火山区地震、地磁、体应变和地热等观测资料的分析,对火山区深部岩浆活动的状态进行了初步评估。研究认为海口全新世火山区最后一次火山喷发距今约4 000a左右,其现今火山活动已趋于平静,未来的火山活动可能向1605年琼州7.5级大地震震中区迁移。

关键词: 火山活动, 大地电磁探测, 岩浆囊, 海口