共查询到18条相似文献，搜索用时 125 毫秒
1.
2.
腾冲火山活动监测,预测与对策研究中的若干重要问题 总被引：2，自引：1，他引：1
《膳冲火山活动监测、预测与对策研究》项目是一项集火山活动监测研究、防灾及资源综合开发与利用为一体的系统工程。需要火山地质、地震、地球化学、地球物理、地壳形变及地热等诸多相关学科的合理配置和联合攻关。在过去的３０年,众多学和研究实体对腾冲火山进行 大量的观察和研究获得一批与火山活动的相关的基础研究成果。其中也不乏说明腾冲火山存在在喷发危险性的证据。为了保证本重大项目能在有限时间内及有限的人力、财务 相似文献
3.
中国大陆有很多火山,如五大连池火山、长白山火山、腾冲火山、海南火山、大同火山和昆仑山火山等,其中五大连池火山、长白山火山和腾冲火山被认为是活火山(刘嘉麒,1999;刘若新,2000).人们对这些火山区已开展了大量研究工作,但深部起源问题还一直不太清楚. 相似文献
4.
腾冲火山地质研究述评 总被引：7，自引：0，他引：7
在综合分析前人有关腾冲火山研究成果的基础上，对该区火山活动的研究现状，火山活动特征，火山活动背景及火山活动与深部岩浆侵入活动的关系等进行了评述。认为腾冲火山群中存在全新世活火山，现今处于休眠状态，具有再次喷发的潜在危险性，因此，进一步深入研究腾冲火山在全新世活动的时间分布规律，对于在该区开展火山活动监测，减灾防灾等方面具有重要意义。 相似文献
5.
腾冲新生代火山分布特征 总被引：32，自引：11，他引：21
通过实地考察和资料对比,综合前人研究成果。最终得出腾冲地区新生代火山有６８座,并给出各个火山主要分布特征。同时根据火山喷发类型、岩性、时代、地域等相关性,腾冲火山区新生代火山划分为７个火山群;１．鸦乌山－－大黑山火山群;２．大团山－－黑龙湾火山群;３．马站火山群;４．打鹰山－－马鞍山火山群;５．余家大山－大六冲火山群;６来凤山－三益村火山群;．７大呼山－－照壁山火山群。腾冲新生代火山分布肯有数量多 相似文献
6.
"火山灾害预警研究"项目成果介绍 总被引：2，自引：0，他引：2
本文详细介绍了“火山灾害预警研究”项目的立项背景、目标、所开展的主要工作、取得的成果、研究成果的社会效益和对该领域研究未来工作的展望。 相似文献
7.
云南腾冲火山地区的地震类型 总被引：2，自引：0，他引：2
详细记述了与腾冲火山活动有关的历史地震资料,重点分析了１９６１年６月１２日腾冲玉壁山Ｍ５．８级地震和１９７６年７月２１日腾冲Ｍ５．１级地震的类型,半讨论了腾冲火山地下介绍与周边地区的差异性,结果表明,发生于腾冲火山地区的地震,有部份属于火山地城类型,腾冲火山不是死火山,火山下部的岩浆仍在活动。 相似文献
8.
"琼北火山探查及喷发危险性研究"项目成果介绍 总被引：2，自引：0，他引：2
本文详细介绍了"火山灾害预警研究"项目的立项背景、目标、所开展的主要工作、取得的成果、研究成果的社会效益和对该领域研究未来工作的展望。 相似文献
9.
腾冲火山地区微震观测(Ⅰ) 总被引：4，自引：0，他引：4
Ye Jianqing Chen Mingong Liu Xuejun Cai Shaoping Cai Mingjun Qin Jiazheng Huangfu Gang Liu Zuyin 《地震研究》1998,(4)
本文综述了腾冲火山地区微震观测台网的建立与所取得的具有研究价值的地震记录。内容包括观测系统性能、台站布局、地震记录。由观测资料表明腾冲火山地区存在微震活动。讨论了台网需要努力的目标。 相似文献
10.
腾冲火山地热区的构造演化与火山喷发 总被引：7，自引：0，他引：7
讨论了腾冲地区在Ｄ－Ｅ２时期的板块拼合演化过程及其大地构造单元位置，用以说明腾冲火山地热区的现今区域构造条件，讨论了火山喷发时期与板块碰撞时代的关系。 相似文献
11.
12.
Topographic, magnetic and gravity surveys have been made over an extinct volcano in the Afar Depression. Previous work showed that this volcano was formed under water. Gravity measurements over the volcano indicate that a positive mass contrast of 1 gm. cm?3 is required below the volcano, which could be explained by the density contrast between a basalt plug and surrounding sediments. There is no observable magnetic anomaly over the volcano. The hyaloclastites of which the volcano is mainly composed have magnetization which is small in intensity but consistent in direction with the Earth’s magnetic field. Basalt cobbles which are present in small quantities have a fairly high intensity of magnetization but directions which bear no relationship to the direction of the Earth’s field. The absence of a magnetic anomaly suggests that the basalt plug below the volcano must have been sufficiently brecciated so that random rotations of portions of the plug have occurred, thus reducing the mean magnetization, and explaining the absence of a magnetic anomaly. 相似文献
13.
14.
Neeraj Awasthi Jyotiranjan S. Ray Amzad H. Laskar Alok Kumar M. Sudhakar Rajneesh Bhutani Hetu C. Sheth Madhusudan G. Yadava 《Bulletin of Volcanology》2010,72(9):1131-1136
Barren Island (Andaman Sea) is the northernmost active volcano of the Indonesian Arc. To construct the eruptive history of
this little studied volcano, we measured 14C dates of inorganic carbon in sediment beds, and Sr and Nd isotopic ratios of seven discrete ash layers, in a marine sediment
core collected from 32 km southeast of the volcano. The study reveals that the volcano had seven major ash eruptions at ~70,
69, 61, 24, 19, 15, and 10 ka. The ash layers erupted from 70 ka through 19 ka have highly uniform Nd isotopic composition,
and since the ~15 ka eruption to the present the isotopic composition has been highly variable. Between ~24 ka and ~10 ka,
the volcano had large ash eruptions spaced at 4,500 year intervals. Isotopically correlating the precaldera lavas and ash
exposed on the volcano to the uppermost ash layer in the core, we infer that the caldera of Barren Island volcano is younger
than 10 ka. 相似文献
15.
长白山天池火山地震观测以来，记到了许多微小地震，对此，引起了许多专家们的关注。本文通过几年来观测到的资料分类和比较研究，对长白山天池火山地震波形特征进行详细的剖析，把长白山地震波形分成两大类，从第一类波形中找出反射波特征。 相似文献
16.
C. Chen 《Bulletin of Volcanology》1978,41(4):513-528
The Pleistocene volcanic rocks from northern Taiwan include the Tatun volcano group and the Chilung volcano group. Three rock types occur in this area: Tatun volcano group yield high-alumina basalt and andesites, whereas the chilung volcano group mainly consists of dacites. In addition, amphibole-rich nodules have also been found in different cruptive units of the former volcano group. Around seventy sample of various rock types have been conducted for geochemical studies, including analyses of major elements and trace elements such as Co, Cr, Cu, Li, Ni, Zn, Zr, V, Rb and Sr. Results of Al2O3, MnO, TiO2 total alkali content, MgO/ΣFeO and K2O/Na2O ratios and AMF diagram indicate that these Pleistocene volcanic rocks belong to typical calalkaline rock series. Detailed study of the trace elements reveals that these volcanic rocks are closely correlated with rocks of continental margin type with respect to Rb, Cu, Co, Ni, V and Cr contents, and K/Rb and Ni/Co ratios. These rocks are most probably derived from the fractionation of basaltic magma controlled mainly by the crystallization of amphibole and plagioclase with magnetite playing a minor role. 相似文献
17.
A. Tibaldi F.A. Pasquarè D. Papanikolaou P. Nomikou 《Journal of Volcanology and Geothermal Research》2008
This study uses on-land and offshore geological and structural data to demonstrate that a huge lateral collapse involved the SE flank of Nisyros volcano. The collapse beheaded the summit part of the volcano and also involved the submarine portion of the slope, producing a large debris avalanche deposit with a volume of about 1 km3 which has been recognized on the sea floor. On-land, stratigraphic and structural data indicate that a thick succession of lava flows (Nikia lavas) was emplaced in a huge horseshoe-shaped depression open seaward and extending below the sea. The magma-feeding system in the volcano, pre-dating and following the collapse, was structurally influenced by a dominant NE–SW direction, which is perpendicular to the newly-recognised sector collapse. The NE–SW structural trend is consistent with the regional tectonic structures found offshore around Nisyros and with the related NW–SE extension direction. We suggest that the lateral magma pressure produced by repeated magma injections along tectonic discontinuities contributed to destabilise the volcano flank. The occurrence of a pyroclastic deposit that mantled the scar left by the collapse suggests that a magma batch might have been injected inside the volcano and triggered the collapse. The lavas of the pre-collapse edifice have been deposited in alternating submarine and subaerial environments, suggesting that vertical movements might also be a major triggering mechanism for large lateral collapses. Recognition of this phenomenon is particularly important in recent/active island or coastal volcanoes, as it can trigger tsunamis. 相似文献
18.
腾冲火山区地震构造应力场研究 总被引：5，自引：2，他引：3
通过对腾冲火山区强震和中小地震震源机制制解分析,对火山区构造应力场方向空间分布,以及震源类型和破裂特征作了研究。利用腾冲火山区中小地震地震波资料,计算得到的地震震源处剪应力强度值,对火山区应力场强度或初始应力状态进行了研究。腾冲火山区构造庆力场主要为北北东－北东－北东东向,接近水平的压应力场。腾冲火山区凛环境剪应力场高值区所包围的低剪应力值分布区。腾冲火山区地震震源具有多种类型,震源破裂具有多种形 相似文献