The idea and project of the “Medium－Scale Experiment Field for Earthquake Prediction”──Research on observations and applications of mining earthquake in Mentougou Coal Mine

Ｔｈｅｉｄｅａａｎｄｐｒｏｊｅｃｔｏｆｔｈｅ“Ｍｅｄｉｕｍ┐ＳｃａｌｅＥｘｐｅｒｉｍｅｎｔＦｉｅｌｄｆｏｒＥａｒｔｈｑｕａｋｅＰｒｅｄｉｃｔｉｏｎ”Ｒｅｓｅａｒｃｈｏｎｏｂｓｅｒｖａｔｉｏｎｓａｎｄａｐｐｌｉｃａｔｉｏｎｓｏｆｍｉｎｉｎｇｅａｒｔｈｑ...     

The mechanism of regional gravity changes before and after the Tangshan earthquake

ＴｈｅｍｅｃｈａｎｉｓｍｏｆｒｅｇｉｏｎａｌｇｒａｖｉｔｙｃｈａｎｇｅｓｂｅｆｏｒｅａｎｄａｆｔｅｒｔｈｅＴａｎｇｓｈａｎｅａｒｔｈｑｕａｋｅＲＵＩ－ＨＡＯＬＩ（李瑞浩）ＪＩＡＮ－ＬＩＡＮＧＨＵＡＮＧ（黄建梁）ＨＵＩＬＩ（李辉）ＤＯＮＧ－ＳＨＥＮＧ...     

空区参数法在新疆天山地区地震预报中的应用研究

应用吉尔吉斯斯坦地震研究所介绍的空区参数法，对新疆天山地区进行分时空扫描计算和Ｒ值评分检验，筛选出有一定预报效能的１０个小区，确定了异常判据和预测规则。１９９３年１０月，根据Ａ１、Ａ２小区出现的空区参数异常，对１９９３年１２月１日疏附６．０级地震作出预报，预报三要互完全正确。     

内蒙古达茂旗北部早古生代花岗岩类SHRIMP U-Pb年代学

本文对内蒙古达茂旗北部的岛弧侵入岩进行了精确的SHRIMP锆石U-Pb定年研究和地球化学研究。该侵入岩具有正常岛弧和埃达克岩的双重地球化学性质。SHRIMP 锆石U-Pb定年表明,这套侵入岩中的闪长岩形成于452±3 Ma 和440±2 Ma,石英闪长岩形成于446±2 Ma,花岗闪长岩形成于440±2 Ma,它们记录了晚奥陶纪末的洋壳消减事件。在一个细粒闪长岩中,分辩出了1967±13 Ma （n=3）的继承性锆石,指示这一岛弧可能具有一个前寒武纪的大陆基底。     

历史交通地理视角下的南岭古通道

基于历史文献资料,从历史交通地理的视角探讨南岭五岭是哪五岭,并对其地理位置及成名进行考证,探讨南岭五岭通道的形成及其在历史交通上所发挥的作用,以及这种作用随着朝代更迭的历史性变化。分析结果认为：1）五岭因其驿道而著名,因此五岭更多是指5条重要古驿道,今天的五岭通常指：大庾岭、骑田岭、都庞岭、萌渚岭、越城岭;2）有学者认为南岭最东端的筠门岭驿道也很重要,它是联系赣南和粤东的重要通道。因此,我们认为,南岭古称“五岭”,改称为“六岭”也是未尝不可;3）南岭古驿道的历史功能更多的是商道,由商道而带来了更深的经济文化交往和人口迁移;4）五岭的交通重心随着政治经济的更迭变化和大庾岭通道的开通而发生了由西到东偏移。     

厦门市同安区生态安全格局构建

以厦门市同安区为例,运用遥感生态指数开展生态质量评价,并基于多期数据判断生态质量稳定性,识别生态源地;选取土地覆被、植被覆盖、地形坡度和距水域距离等因子构建生态阻力基面,并采用夜间灯光数据修正人类活动对生态阻力值的影响;进而运用最小累积阻力模型构建生态阻力面,识别生态缓冲区、廊道和节点,构建城市生态安全格局。研究表明：1）2006、2010和2015年同安区RSEI指数分别为0.577 3、0.664 8和0.632 9,生态质量均处于良等,但在2006—2015年间出现先上升后略微下降的变化。2）同安区生态安全格局由生态源地高、中、低3级缓冲区,44条源间廊道和20个生态节点组成。其中,生态源地总面积为293.19 km2,占全区总面积的44.12%。高、中、低3级缓冲区面积分别为478.81、99.52和83.36 km2,分别占全区面积的72.36%、15.04%和12.60%。3）提出以生态安全格局为基础构建“生态安全屏障—廊道—基质”的生态保护框架,为城镇开发提供参考。基于遥感生态指数综合识别的生态源地,具有高生态系统服务价值和高生态敏感性,分布与重要生态功能区基本一致,可为生态安全格局源地识别方法提供参考。     

Oscillation of Surface PM<Subscript>2.5</Subscript> Concentration Resulting from an Alternation of Easterly and Southerly Winds in Beijing: Mechanisms and Implications

We used simultaneous measurements of surface PM_2.5 concentration and vertical profiles of aerosol concentration, temperature, and humidity, together with regional air quality model simulations, to study an episode of aerosol pollution in Beijing from 15 to 19 November 2016. The potential effects of easterly and southerly winds on the surface concentrations and vertical profiles of the PM_2.5 pollution were investigated. Favorable easterly winds produced strong upward motion and were able to transport the PM_2.5 pollution at the surface to the upper levels of the atmosphere. The amount of surface PM_2.5 pollution transported by the easterly winds was determined by the strength and height of the upward motion produced by the easterly winds and the initial height of the upward wind. A greater amount of PM_2.5 pollution was transported to upper levels of the atmosphere by upward winds with a lower initial height. The pollutants were diluted by easterly winds from clean ocean air masses. The inversion layer was destroyed by the easterly winds and the surface pollutants and warm air masses were then lifted to the upper levels of the atmosphere, where they re-established a multi-layer inversion. This region of inversion was strengthened by the southerly winds, increasing the severity of pollution. A vortex was produced by southerly winds that led to the convergence of air along the Taihang Mountains. Pollutants were transported from southern–central Hebei Province to Beijing in the boundary layer. Warm advection associated with the southerly winds intensified the inversion produced by the easterly winds and a more stable boundary layer was formed. The layer with high PM_2.5 concentration became dee-per with persistent southerly winds of a certain depth. The polluted air masses then rose over the northern Taihang Mountains to the northern mountainous regions of Hebei Province.     

Oscillation of Surface PM_(2.5) Concentration Resulting from an Alternation of Easterly and Southerly Winds in Beijing: Mechanisms and Implications

We used simultaneous measurements of surface PM_(2.5) concentration and vertical profiles of aerosol concentration,temperature, and humidity, together with regional air quality model simulations, to study an episode of aerosol pollution in Beijing from 15 to 19 November 2016. The potential effects of easterly and southerly winds on the surface concentrations and vertical profiles of the PM_(2.5) pollution were investigated. Favorable easterly winds produced strong upward motion and were able to transport the PM_(2.5) pollution at the surface to the upper levels of the atmosphere. The amount of surface PM_(2.5) pollution transported by the easterly winds was determined by the strength and height of the upward motion produced by the easterly winds and the initial height of the upward wind. A greater amount of PM_(2.5) pollution was transported to upper levels of the atmosphere by upward winds with a lower initial height. The pollutants were diluted by easterly winds from clean ocean air masses. The inversion layer was destroyed by the easterly winds and the surface pollutants and warm air masses were then lifted to the upper levels of the atmosphere, where they re-established a multi-layer inversion. This region of inversion was strengthened by the southerly winds, increasing the severity of pollution. A vortex was produced by southerly winds that led to the convergence of air along the Taihang Mountains. Pollutants were transported from southern–central Hebei Province to Beijing in the boundary layer. Warm advection associated with the southerly winds intensified the inversion produced by the easterly winds and a more stable boundary layer was formed. The layer with high PM_(2.5) concentration became dee-per with persistent southerly winds of a certain depth. The polluted air masses then rose over the northern Taihang Mountains to the northern mountainous regions of Hebei Province.