The comparison analysis of Chinese public perception of earthquakes on different time scales

China has suffered from severe earthquake disasters in recent years. In order to explore the impact of severe earthquakes on public risk perception on different time scales, four surveys were conducted twice each after the severe Wenchuan and Yushu earthquakes. t tests were performed between two consecutive surveys to explore the change of public risk attitudes. The results demonstrated that after the two severe earthquakes, the public seismic risk acceptance has increased over time, and the comparison between pre- and post-Yushu earthquake illustrated that the severe disaster had more impact on vulnerable population such as females, children and low-income people. Moreover, linear regression models were employed to find the determining factors of public acceptance towards earthquake risks. It was discovered that the public perceived earthquake effect had significant negative relationship with seismic risk acceptance, and public trust towards local government had positive relationship with the risk acceptance. This study could help government to gain better understanding of public mental status and take more effective disaster preparedness measures when preventing and responding to a severe earthquake.     

Probabilistic Inverse Analysis of Excavation-Induced Wall and Ground Responses for Assessing Damage Potential of Adjacent Buildings

This paper presents an approach for the probabilistic inverse analysis of braced excavations based on the maximum likelihood formulation. Here, the soil parameters are updated using the observations of the maximum ground settlement and/or the maximum wall deflection measured in a staged excavation. The updated soil parameters are then used to refine the predicted wall and ground responses in the subsequent excavation stages, as well as to assess the building damage potential at the final excavation stage. Case study shows that the proposed approach is effective in improving the predictions of the excavation-induced wall and ground responses. More-accurate predictions of the wall and ground responses, in turn, lead to a more accurate assessment of the damage potential of buildings adjacent to the excavation. The proposed approach offers an effective means for a probabilistic inverse analysis of braced excavations.     

A preliminary discussion on the opportunities and challenges of linking climate change adaptation with disaster risk reduction

Managing the risks of extreme events such as natural disasters to advance climate change adaptation (CCA) has been a global focus. However, a critical challenge in supporting CCA is to improve its linkage with disaster risk reduction (DRR). Based on discussions on similarities and differences between CCA and DRR concerning their spatial–temporal scales, main focuses, preferred research approaches and methodologies, etc., this paper tentatively put forward an analytical framework of “6W” for linking DRR with CCA. This framework presented preliminary answers to a series of fundamental questions, such as “What is adaptation with respect to disaster risk?” “Why adaptation is needed?” “Who adapt to what?” “How to adapt?” “What are the possible principles to assess the adaptation effect?” To bridge the research gaps between CCA and DRR, it is imperative to associate the adaptation actions with both near-term disaster risk and long-term climate change and formulate adaptation strategies at various spatial–temporal scales by embracing uncertainty in a changing climate.     

秦岭山阳-柞水地区燕山期中酸性侵入岩地球化学特征、锆石U-Pb年龄及Lu-Hf同位素组成

秦岭山阳-柞水地区广泛出露燕山期中酸性花岗(斑)岩体,并有大量与其相关的斑岩-矽卡岩型Cu-Mo-Fe、Cu-AuFe矿化。LA-ICP-MS锆石U-Pb测年结果表明,与矿化密切相关的斑岩体形成于144.6~141.5Ma。岩石地球化学分析结果表明,这些花岗(斑)岩体SiO2含量为55.73%~67.80%,K2O含量为2.52%~6.40%,Na2O含量为1.94%~5.19%,Al2O3含量为14.61%~16.10%,FeOT含量为2.1%~9.0%,MgO含量为1.32%~5.52%,主体显高钾钙碱性准铝质特征。A/CNK1.1,P2O5与SiO2负相关,Mg#平均为49,含有角闪石、黑云母、榍石、磁铁矿等矿物,属I型花岗岩类;稀土元素分异明显,无明显Eu异常;富集K、Rb、Sr、Ba等大离子亲石元素,Nb、Ta、Ti、P和Hf等高场强元素亏损,属后碰撞型花岗岩。岩体的锆石εHf(t)为-4.5~+1.78,平均为-0.87,表明其岩浆源区为地壳物质的熔融岩浆与幔源岩浆的混合,且以地壳熔融成份为主;Hf同位素二阶段模式年龄(t DM2)为1479~1084Ma,表明其壳源源区物质可能形成于中晚元古代(1.4~1.0Ga)。     

巴布亚新几内亚奥克泰迪铜金矿床成矿特征和控制因素

巴布亚新几内亚西部Fubilan山奥克泰迪矿床是一个世界级铜金矿床,在大地构造上位于新几内亚造山带的巴布亚褶皱带。该矿床的铜金矿化赋存于Fubilan二长斑岩及其周边的磁铁矿夕卡岩和硫化物夕卡岩中。矿石类型以原生硫化物矿石为主,金属矿物包括磁铁矿、黄铁矿、磁黄铁矿、白铁矿、黄铜矿、斑铜矿等。蚀变类型包括夕卡岩化、钾化、泥化和青盘岩化。矿床氧化次生富集带发育,表生矿石矿物为蓝辉铜矿、辉铜矿、自然铜、铜蓝和银金矿。成矿作用主要受区域构造、侵入杂岩体、Darai组灰岩地层、断裂等因素的控制。根据矿床的主岩、矿石特征、蚀变特征和控矿因素,认为该矿床成因类型属于较为典型的夕卡岩一斑岩型矿床。     

Development of an empirical model for rainfall-induced hillside vulnerability assessment: a case study on Chen-Yu-Lan watershed,Nantou, Taiwan

In Taiwan, the hillside is about 70 % of total area. These areas also have steep topography and geological vulnerability. When an event of torrential rain comes during a typhoon, the landslide disasters usually occur at these areas due to the long duration and high intensity of rainfall. Therefore, a design which considers the potential landslide has become an important issue in Taiwan. In this study, a temporal characteristic of landslide fragility curve (LFC) was developed, based on the geomorphological and vegetation factors using landslides at the Chen-Yu-Lan watershed in Taiwan, during Typhoon Sinlaku (September 2008) and Typhoon Morakot (August 2009). This study addressed an effective landslide hazard assessment process, linking together the post-landslide damage and post-rainfall data for LFC model. The Kriging method was used to interpolate the rainfall indices (R ₀, R, I) for numerical analysis. Remote sensing data from SPOT images were applied to analyze the landslide ratio and vegetation conditions. The 40-m digital elevation model was used for slope variation analysis in the watershed, and the maximum likelihood estimate was conducted to determine the mean and standard deviation parameters of the proposed empirical LFC model. This empirical model can express the probability of exceeding a damage state for a certain classification (or conditions) of landslides by considering a specific hazard index for a given event. Finally, the vulnerability functions can be used to assess the loss from landslides, and, in the future, to manage the risk of debris flow in the watershed.     

The Influence of Pan Evaporation Conditions on Na Cl crystallization

正1 Introduction Crystallization is one of important unit operations in the chemical production process,which requires not only the crystal product with high purity and yield,but also the available particle size of the crystal products to ensure product quality.Crystallization process is affected by     

Research of Recycled Salt and Glauber’ Salt Precipitation Rules of Yabulai Salt Lake Brine

正1 Introduction The main production of Yabulai salt lake was original salt and recycled salt many years ago.After decade’s production,the sale lake resource is more and more deficient.Glauber's salt and magnesium salt are concentrated in brine now.It could affect the quality of the salt.In recent years,research had done much work to     

A Preliminary Study of Holocene Climate Change and Human Adaptation in the Horqin Region

Abstract: Human activity during the Holocene in the Horqin region, northeastern China, has been widely documented. As an important proxy record of human activity, black carbon (BC) in sediments has been linked to climate change and human adaptation. A loess-paleosol section located in south Horqin was chosen for this study. Holocene climate change and human adaptation to the environment were discussed by analyzing BC, organic carbon (OC) and other proxies. The conclusions included: (1) before 3900 cal BP, human activity was closely related to the natural environment and cultural development was dominated by climate change. For example, the rapid decline of the agrarian Hongshan culture was caused by a slight decrease in temperature at ~5000 cal BP; (2) during 3900-3200 cal BP, the heavy dependence of human societies on nature gradually lessened and the ability of those human societies to adapt to the environment was enhanced. However, the farming-dominated Lower Xiajiadian culture was nonetheless replaced by the pastoralist Upper Xiajiadian culture due to an extremely cooling event at ~3200 cal BP; (3) during the late Holocene period, the marked influence of climate change on human activity might have lessened as a result of a clear improvement in human labor skills. After this, human living styles were influenced by cultural developments rather than climate change because humans had mastered more powerful means of productivity.     

云南易门凤山铜矿床“阶梯空当”定位矿体及其构造地球化学异常证据

通过易门凤山铜矿床控矿构造解析与13~15中段南部矿体空间位置对比,矿体向SW深部侧伏,预测15中段2、4号矿体的SW端深部具找矿潜力。在纵投影图上,夹持矿体的"空当"呈现"阶梯、斜列、平行、等距"特点,表现出三个"空当"带与四个矿体带相间交替、平行斜列的组合型式。推测"阶梯空当"夹持的四个空白区为有利的找矿地段。在24号勘探线以南、15中段坑道开展1︰500断裂构造地球化学填图,圈定了5个铜异常和3个主要的元素组合(Cu-In-Bi-Hg-Sb)异常,其中,Ⅱ、Ⅲ号异常与"阶梯空当"定位的d、e位置相对应,为重点找矿靶区,对凤山铜矿床南部、深部找矿具有指示意义。