The May 12, 2008 Wenchuan earthquake of China (Mw 7.9 or Ms 8.0) triggered hundreds of thousands of landslides. Mapping such a large number of landslides is a major task, considering the large size ...of the affected area and the availability of pre- and post-earthquake remote sensing images. This paper compares three (nearly) complete landslide inventories that were compiled from visual image interpretation. The three inventories differ in the manner in which the landslides are represented, either as polygons, centroid points, or top points. Landslides in the three inventories use one-to-one correspondence. Each of the three inventories includes a large proportion of the 197,481 landslides triggered by the earthquake. These landslides were delineated as individual solid polygons and points using visual interpretation of high-resolution aerial photographs and satellite images acquired following the earthquake and verified by selected field checking throughout a broad area of approximately 110,000 km
2
. These landslides cover a total area of approximately 1,160 km
2
. Based on the inventories of landslide polygons and landslide centroid points, two types of density maps were constructed. Correlations of landslide occurrence with seismic, geologic, and topographic parameters were analyzed using the three landslide inventories. Statistical analysis of their spatial distribution was performed using both the landslide area percentage (LAP), defined as the percentage of the area affected by the landslides and the landslide number density (LND), defined as the number of landslides per square kilometer. There are two types of LNDs: the LND-centroid (based on the centroid point of the landslide) and the LND-top (based on the top point of the landslide). We used the three indexes to determine how the occurrence of the landslides correlates with elevation, slope angle, slope aspect, slope position, slope curvature, lithology, distance from the epicenter, seismic intensity, distance from the Yingxiu-Beichuan surface fault rupture, peak ground acceleration (PGA), and coseismic surface displacements (including horizontal, vertical, and total displacements). Both the LAP and the two types of LND values were observed to have continuous positive or negative correlations with the slope angle, slope curvature, distance from the epicenter and from the Yingxiu-Beichuan surface fault rupture, seismic intensity, and coseismic surface displacement. In addition, the highest values of the LAP and LND values appear at ranges from 1,200 to 3,000 m in elevation. Moreover, the landslides have preferred orientations, dominated by the eastern, southeastern, and southern directions. In addition, the sandstone, siltstone (Z), and granitic rocks experienced more concentrated landslides. No obvious correlations were observed between the LAP and LND values and slope position. Finally, we studied the orders of eight earthquake-triggered landslide impact factor effect on landslide occurrence.
Highlights
The 197,481 landslides triggered by the 2008 Wenchuan earthquake were delineated.
Three landslide inventories were constructed: polygon, centroid, and top point inventories.
The landslides were spatially analyzed with topographic, lithology, and seismic parameters.
The M8.0 Wenchuan Earthquake occurred in China on May 12, 2008, killing over 69,000 people and displacing millions from their homes. This was one of the most catastrophic natural disasters on record. ...This book includes 5 chapters describing the tectonic setting and historical earthquakes around the Chuan-Dian region, the nucleation of the Wenchuan earthquake, occurrence and aftershocks. The field observations of earthquake induced surface fractures and building damage, form a major and special part of this book and include a large number of digital photos with accompanying explanantions.
Recent research suggests pre‐existing network structural dynamics can hamper inter‐organizational alliance formation, particularly for poorly embedded firms. However, this research fails to fully ...explain how poorly embedded firms can overcome these structural barriers when forming alliances. This study adds to the existing knowledge on network dynamics by proposing how interpersonal relational embeddedness alleviates such constraints and facilitates alliance formation of firms poorly embedded in existing alliance networks. We highlight the informational and sociological benefits of inter‐firm managerial social ties (IFMSTs) formed through interpersonal social experiences beyond those originated from prior business exchange activities between potential partnering firms. Our empirical investigation employs an extensive sample of US public firms and shows strong evidence that IFMSTs help poorly embedded firms overcome the obstacles imposed by their inferior network structure embeddedness when forming alliances. The negative effect of inferior network structural embeddedness is more muted by IFMSTs when both firms in a dyad are at the periphery of the alliance network than when they occupy asymmetric structural positions. This mitigation effect of IFMSTs is more salient when the ties originate from activity‐based social experiences than from shared educational affiliations.
The accurate consideration of seismic wave propagation through discontinuous media is crucial in rock engineering. Discontinuous deformation analysis (DDA), with the ability to study discontinuity ...behaviors, is modified by incorporating a seismic input method based on a viscous boundary and the free-field theory. After confirming the accuracy of the modified DDA using several verification examples, two practical applications, (1) the extreme ground motion during the 2008 Iwate–Miyagi earthquake, Japan, and (2) the Donghekou landslide induced by the 2008 Wenchuan earthquake, China, are simulated and reproduced by the modified DDA. The results show that seismic wave propagation through discontinuous media can be accurately simulated by the modified DDA. Further, the simulation results indicate that discontinuities are critical in the dynamic response of structures. Conclusively, the modified DDA provides an alternative approach for analyzing the dynamic response of sites containing discontinuities.
•Modified DDA by incorporating seismic input method based on viscous boundary and free-field theory.•Modified DDA applied to assess dynamic response of sites containing discontinuities.•Investigated and explained extreme ground motion with strong asymmetry.•Reproduced earthquake-induced landslide with high velocity and long runout.
European Union Law and Private International Law both attempt to resolve a conflict of laws. There is however a certain tension between the two disciplines. The present book proposes suggestions to ...enhance their mutual understanding.
Existing studies have shown that the COVID-19 pandemic caused a sharp drop in carbon emissions in 2020. A recent example of the impact of sudden extreme events on carbon emissions occurred in the ...2008 global financial crisis, in which carbon emissions droped in 2009, but jumped in 2010. This study is aimed to discuss how to prevent the retaliatory growth of carbon emissions post COVID-19 through learning the lessons from analysis of short-term and long-term drivers of carbon emissions. This study explored the short-term (annual) effects (population scale. affluence level, carbon intensity, energy intensity) of changes in carbon emissions by decomposing carbon emissions in the world, different income groups and selected countries before and after the 2008 financial crisis using LMDI technique. In addition, this study explored the long-term effects (energy consumption per capita, energy structure, energy intensity, foreign direct investment, and trade openness) of changes in carbon emissions by decomposing carbon emission in the world and different income groups from 1990 to 2014 using VAR technique. The decomposition results of short-term drivers of carbon emission uncovered that the deterioration in energy efficiency (increase in energy intensity) was the main reason for the retaliatory rebound in carbon emissions post-2008 financial crisis, especially in high-income countries. The decomposition results of long-term drivers of carbon emission uncovered that trade openness contributed to reduce carbon emission in the world and the incomes groups in the long term, although trade openness led to increase in carbon emission in developing countries in the short term. To prevent retaliatory rebound of carbon emissions, what we should learn two lessons from the decomposition of carbon emission: improving energy efficiency, and expanding trade openness. Unfortunately, energy efficiency has been neglected in the economic recovery plans to respond to COVID-19 of various countries, especially developed countries, and worse, trade protectionism is on the rise, especially in developed countries. Therefore, we are pessimistic about preventing a retaliatory rebound in carbon emissions post-COVID-19 for now.
Display omitted
•Global economy and three income level groups are selected as study objects.•G7 group and BRICS countries are selected for specific countries study.•Carbon reduction can take a lesson from 2008 global economic crisis.•Energy intensity is critical for avoid retaliatory rebound after COVID-19 pandemic.•Affluence level is still primary contributor to carbon emission increase.
The impact trajectory of asteroid 2008 TC3 Farnocchia, Davide; Jenniskens, Peter; Robertson, Darrel K. ...
Icarus (New York, N.Y. 1962),
09/2017, Letnik:
294
Journal Article
Recenzirano
Odprti dostop
•2008 TC3 was the first ever predicted impact of an asteroid.•We compute the trajectory of 2008 TC3 using almost 900 astrometric observations.•The 3-sigma impact ellipse is 1.4 km × 0.15 km at the ...entry point into the atmosphere.•The ground track is compatible with the location of recovered meteorites.
The impact of asteroid 2008 TC3 was an unprecedented event—the first ever predicted impact of a near-Earth object. When it was first detected about 20 h before impact, 2008 TC3 was still farther away than the Moon. Once it was recognized as an impactor and announced as such, 2008 TC3 began to receive considerable attention from astronomical observers. Using the unprecedented dataset of nearly 900 astrometric observations and the latest observation debiasing and weighting techniques, we estimate the precise trajectory of 2008 TC3 and its impact ground track. At the entry point into the atmosphere, the 3-σ formal uncertainty in predicted position is an ellipse only 1.4 km × 0.15 km in size. The locations of the many meteorites recovered from the desert floor mark the asteroid’s actual ground track and provide a unique opportunity to validate trajectory models. We find that the second-order zonal harmonics of the Earth gravity field moves the ground track by more than 1 km and the location along the ground track by more than 2 km, while non-zonal and higher order harmonics change the impact prediction by less than 20 m. The contribution of atmospheric drag to the trajectory of 2008 TC3 is similar to the numerical integration error level, a few meters, down to an altitude of 50 km. Integrating forward to lower altitudes and ignoring the break-up of 2008 TC3, atmospheric drag causes an along-track deviation that can be as large as a few kilometers at sea level.
Abstract
Relatedness has often been shown to have a central role in regional diversification. Knowledge flows between related industries are an important source of innovation, leading to industry ...growth and the establishment of new industries. Earlier studies have focused on dynamic diversification into new industries, but in this study, we emphasize static diversification, that is, changes in the balance between existing industries in a region. We use linked employer–employee data from Denmark and construct a range of measures at the level of regional industries. The role of relatedness in static diversification 2008–2013 is then analyzed based on industry characteristics in 2008. We find that relatedness plays a more important role in regions that are either spatially peripheral or economically non-peripheral, while relatedness has no relationship to static diversification on average. In addition to the empirical result, we contribute by comparing indices of relatedness, suggesting an alternative employment-weighted index, and conceptualizing relatedness as itself a disparity dimension of diversity. We finally ask how static and dynamic diversification affect disparity. We find that human capital intensity plays an important role in the link between diversification and the evolution of disparity.
"A major contribution to the study of global events in times of global media. Owning the Olympics tests the possibilities and limits of the concept of 'media events' by analyzing the mega-event of ...the information age: the Beijing Olympics. . . . A good read from cover to cover."
—Guobin Yang, Associate Professor, Asian/Middle Eastern Cultures & Sociology, Barnard College, Columbia UniversityFrom the moment they were announced, the Beijing Games were a major media event and the focus of intense scrutiny and speculation. In contrast to earlier such events, however, the Beijing Games are also unfolding in a newly volatile global media environment that is no longer monopolized by broadcast media. The dramatic expansion of media outlets and the growth of mobile communications technology have changed the nature of media events, making it significantly more difficult to regulate them or control their meaning. This volatility is reflected in the multiple, well-publicized controversies characterizing the run-up to Beijing 2008. According to many Western commentators, the People's Republic of China seized the Olympics as an opportunity to reinvent itself as the "New China"---a global leader in economics, technology, and environmental issues, with an improving human-rights record. But China's maneuverings have also been hotly contested by diverse global voices, including prominent human-rights advocates, all seeking to displace the official story of the Games.Bringing together a distinguished group of scholars from Chinese studies, human rights, media studies, law, and other fields, Owning the Olympics reveals how multiple entities---including the Chinese Communist Party itself---seek to influence and control the narratives through which the Beijing Games will be understood.digitalculturebooks is an imprint of the University of Michigan Press and the Scholarly Publishing Office of the University of Michigan Library dedicated to publishing innovative and accessible work exploring new media and their impact on society, culture, and scholarly communication. Visit the website at www.digitalculture.org.
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