焰山、高山--内蒙古阿尔山火山群中的两座活火山

阿尔山火山群位于内蒙古自治区东部 ,地处大兴安岭中段西缘 ,地理坐标为 1 2 0°1 4′0 0″～ 1 2 1°1 0′0 0″E ,4 7°1 5′0 0″～ 4 7°4 5′0 0″N。火山构造单元上属大同 -大兴安岭新生代火山活动带 (黄镇国等 ,1 993)。火山活动具多期性 ,可分为上新世、更新世和全新世。火山产物覆盖在侏罗纪火山 -侵入岩之上 ,总体呈北东向展布 ,出露面积约 1 30 0 (km) 2 ,上新世为拉斑玄武岩 ,第四纪主要为碱性橄榄玄武岩。火山作用方式既有岩浆爆破式和溢流式 ,也有射气岩浆喷发。以往区域地质调查 ① ,② 和本次初步考察确定阿尔山火山群由 4…     

腾冲火山地质研究述评

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。     

云南省2001年上半年地震活动综述

据云南数字地震台网测定 ,2 0 0 1年上半年云南省共记录到 3级以上地震 5 5次 (不含余震 ) :其中 3～ 3 9级地震 44次、 4～ 4 9级 5次、 5～ 5 9级 5次。 2 0 0 1年上半年云南地区地震活动最显著的特点是历史上少见的中强震连发 (表 1 )。表 1　云南地区 2 0 0 1年上半年 5级地震目录编号发震时间震中位置年月日农历时分秒北纬东经地名 震源深度震级ＭＬ ＭＳ精度12 0 0 1 2 19廿七 2 3-5 1-362 1°2 6′ 10 2°5 0′老挝 10ｋｍ 5 2 42 2 0 0 1 2 2 0廿八 0 3-0 2 -5 12 1°2 2′ 10 2°5 4′老挝 8ｋｍ 5 432 0 0 1 3 12十八 16-5 7…     

腾冲地区新生代火山活动分期

在前人对腾冲火山活动分期基础上,通过实地考察。依据地层披盖关系,地丑对比、火山财貌、岩石类群、岩性等特点并参考同位素年龄测定值,把腾冲新生代火山活动分为四个活动期、九个亚期。第一期火山活动活动始于上新世,第二期火山活动为早更新世,第三期火山活动为晚更新世。第上期火山活动为全新世。     

东北地区2003年第三季度ML≥3.0地震目录

序号发震时间地　震　位　置月日时　分　秒北纬东经地　点震级(ML)深度(km) 精度1 71 42 0 1 5 2 4 940°31′ 1 2 3°0 3′辽宁省海城 3 1 1 2Ⅰ2 72 4 0 2 0 2 4 2 845°5 6′ 1 30°5 0′黑龙江省勃利 3 8Ⅰ3 81 2 0 5 5 1 7 0 5 2°2 8′ 1 2 3°42′黑龙江省塔河 3 7Ⅰ4 81 80 0 331 7 437°5 7′ 1 2 0°43′渤海 3 8Ⅱ5 91 91 9482 7 5 37°48′ 1 2 4°37′黄海 3 4Ⅱ6 92 0 0 82 5 30 0 4 5°1 6′ 1 2 5°1 3′吉林省松原 3 3Ⅰ792 2 0 0 2 95 7 95 3°1 7′ 1 2 4°0 2′黑龙江省漠河 3 2Ⅰ892 2 2 0 5 90 5 0 39°42′ 1 …     

长江中下游-南黄海地震带4次中强震前的地震活动特征

前言 长江中下游-南黄海地震带（以下简称长南带）南部，即31°～32°40′N，118°～124°E地区。该区经济发达，人口稠密，城镇集中，俗称金三角。1970年进入20世纪第四、第五活跃期以来，先后发生了4次5级以上中强地震（表1），形成一个引人注目的中强震连发态势。总结4次地震发生前的地震活动特征，对于今后正确分析和判断江苏南部地区地震的大形势和重点危险区具有十分重要的意义。 表1 长南带4次中强震地震目录 震中位置 序号 发震时间 Nj El 地点 震级Ms 震源深度 /km 震中烈度 1 1974-04-22 31°24.9′ 119°14.5′ 溧阳 5.5…     

2022年第6期封面

岱海（40°32′～40°37′N,112°37′～112°46′E）位于内蒙古自治区,属半干旱地区内陆湖泊. 面积约53 km²(2018年),受气候变化和人类活动影响,湖面萎缩,蓄水量减少,矿化度增加明显.     

东北地区2004年第三季度ML≥3．0地震目录

Theearthquakes (ML≥ 3 0 )catalgueofThirdquarterinNortheasternarea ,2 0 0 4序号 发震时间地震位置月日时分秒 　 北纬东经地点震级(ML)深度(km) 精度1 72 70 61 5 1 8 2 4 3° 32′ 1 2 5 1 4′伊通 3 5 2 0 12 82 1 2 1 1 41 7 0 4 1° 48′ 1 2 75 6′长白山 3 0 13 82 5 2 1 2 90 9 5 39° 2 8′ 1 2 2 1 0′普兰店 3 3 1 1 14982 2 2 4 34 1 42° 0 1′ 1 2 80 1′长白山 3 7 15 92 70 30 61 0 5 4 0° 31′ 1 2 30 1′岫岩与海城交界 3 5 1 3 1东北地区2004年第三季度M_L≥3.0地震目录$辽宁省地震监测中心@梁灿…     

东北地区2002年第四季度M_L≥3.0地震目录

Theearthquakes (ML≥ 3 0 )catalogueofFouthquarterinnortheasternarea ,2 0 0 2序号发　震　时　间地　　震　　位　　置月日时　分　秒北　纬东　经地　　点震级(ML)深度(km)精度110 90 9-3 8-3 4 0 48°48′ 13 0°2 9′黑龙江嘉荫 3 9822 10 12 13 -5 1-4 7 7 3 9°2 3′ 12 2°13′辽宁省普兰店 3 0 1113 10 2 5 0 5 -12 -0 5 5 40°3 6′ 12 2°5 2′辽宁省海城 3 6814 10 2 5 18-3 4-2 5 83 8°3 3′ 12 0°15′渤海 3 7 25 112 19-2 2 -3 2 5 3 8°2 2′ 12 0°2 6′黄海 3 5 26112 5 12 -2 0 -5 0 93 8°5 6′ 12 1…     

东北地区2001年第四季度ML≥3.0级地震目录

Ｔｈｅｅａｒｔｈｑｕａｋｅｓ (ＭＬ≥ 3 0 )ｃａｔａｌｏｇｕｅｏｆＦｏｒｔｈｑｕａｒｔｅｒｉｎｎｏｒｔｈｅａｓｔｅｒｎａｒｅａ ,2 0 0 1序号发　震　时　间月日时　分　秒地　　震　　位　　置北　纬东　经地　　点震级(ＭＬ)深度(ｋｍ) 精度1 1 0 0 1 1 1　 30　 1 4 4 38°0 5′ 1 2 1°5 9′渤海海峡 3 322 1 0 1 5 1 2　 4 5　 1 1 0 4 5°0 7′ 1 2 4°38′吉林省松源市西 3 71 4 131 0 1 80 2　 1 8　 39 0 4 1°34′ 1 2 5°31′吉林省通化大川 3 4 2 5 14 1 0 1 80 2　 1 9　 2 5 0 4 1°36′ 1 2 5°31′吉林省通化大…     

A Monte Carlo study of rainfall forecasting with a stochastic model

A procedure for short-term rainfall forecasting in real-time is developed and a study of the role of sampling on forecast ability is conducted. Ground level rainfall fields are forecasted using a stochastic space-time rainfall model in state-space form. Updating of the rainfall field in real-time is accomplished using a distributed parameter Kalman filter to optimally combine measurement information and forecast model estimates. The influence of sampling density on forecast accuracy is evaluated using a series of a simulated rainfall events generated with the same stochastic rainfall model. Sampling was conducted at five different network spatial densities. The results quantify the influence of sampling network density on real-time rainfall field forecasting. Statistical analyses of the rainfall field residuals illustrate improvement in one hour lead time forecasts at higher measurement densities.     

Earthquake Engineering and Engineering Vibration Aims And Scope

正This journal is established by the Institute of Engineering Mechanics(IEM),China Earthquake Administration,to promote scientific exchange between Chinese and foreign scientists and engineers so as to improve the theory and practice of earthquake hazards mitigation,preparedness,and recovery.To accomplish this purpose,the journal aims to attract a balanced number of papers between Chinese and     

Foreword

Destructive earthquakes have caused great damage in China and the United States and collapsing buildings havecaused many deaths and injuries. The field of earthquake engineering studies earthquake hazards, the occurrence ofearthquakes of various magnitudes, the nature of the ground shaking during an earthquake, the vibration of structuresduring earthquakes, the strengthening of existing structures and the design of new structures to be earthquake resistant,and finally, how to cope with earthquake damage and restore a city to normal functioning. Such efforts are in progressin both countries, but unfortunately, the language barrier interferes with the free flow of information between China andthe Untied States. It would be mutually beneficial if some means could be developed to promote the exchangeof information across the Pacific Ocean. This new journal has been established for this purpose and its success willbe an important step in promoting earthquake engineering in China and the United States.     

WORLD ASSOCIATION FOR SEDIMENTATION AND EROSION RESEARCH(WASER)

正President:Giampaolo Di Silvio,Italy Vice Presidents:Ulrich C.E.Zanke,Germany Zhao-yin Wang,China The World Association for Sedimentation and Erosion Research(WASER),inaugurated on Oct.19,2004,is an independent non-governmental,non-profit organization.The mission of WASER is to promote international co-operation on the study     

Enhancing remote sensing research on global change to improve our understanding on Earth system processes

正Global Change includes climate change and other environmental changes caused by the joint interaction among various layers of Earth. From the positive side, global change provides new opportunities to human and other living forms on Earth. In the meantime, it creates tremendous challenges and negative impact. At present, the negative impacts have reached all primary processes of the global ecosystem and every aspect of human society, especially causing degradation of the ecosystem. For instance, intensive deforestation causes decline of biodiversity; global warming causes sea level rise and increases     

SCIENCE CHINA Earth Sciences SUBJECT INDEX TO VOLUME 57(2014)

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