Summer rainstorm associated with a debris flow in the Amarilla gully affecting the international Agua Negra Pass (30°20′S), Argentina     

Carolina Lauro  Stella M. Moreiras  Sebastian Junquera  Ivan Vergara  Rafael Toural  Johannes Wolf  Ruben Tutzer 《Environmental Earth Sciences》2017,76(5):213

The Central-West region of Argentina was seriously affected by a series of convective summer storms on January–February of 2013 generating many debris flows and rockfall in the Central Andes mountain regions. In particular, the unreported 8th February event caused the sad death of a 10-year-old child being completely ignored by society and local authorities. Despite this, meteorological conditions associated with this event and further episodes were rarely measured and determined mainly due to scarce meteorological stations in Andean mountain areas. In this paper, meteorological data from CMORPH algorithm and measurements of surrounding gauges were analyzed for estimating the triggering precipitation value of this event. As well, the particular debris flow channeled into the main branch of the Amarilla gully in the Agua Negra valley was geomorphologically described. The amount of precipitation associated with this debris flow was 5.5 and 13.2 mm accumulated previous to the event. This violent debris flow was generated in a talus zone in a periglacial environment located just below a covered rock glacier. However, the influence of the permafrost thawing in this process is not feasible. The altitude of the 0 °C isotherm was lower during the previous days of the event, and no monitoring on permafrost is available for this area. The volume of removed mass was estimated in 5 × 10⁴ m³, and the mean velocity was 35 km/h. Boulders of 4 m diameter were found in the source area, while the deposit is up to 75% sandy with clasts that hardly exceed 10 cm in the alluvial fan distal part. Herein the main objective is to advice about the probable catastrophic impact of similar events in the future. These findings could be useful for hazard remediation, mitigation, and prevention plans for the Agua Negra international pass under construction.  相似文献   

太平洋西北地区面临大地震风险     

Ivan G Wong  左玉玲 《国际地震动态》2010,(8):8-12

欢迎来到俄勒冈州波特兰市——我的家乡——参加美国地震学会年会!这里有蓝天（当然是不下雨的时候）,有威拉米特河（Willamette）和哥伦比亚河（Columbia）,有众多的溪流湖泊、壮丽的火山峰（晴天时朝北方和东方看）,有绿树、绿树、  相似文献   

长周期大地电磁测深研究——青藏高原东部LMT响应函数及应用   总被引：4，自引：2，他引：2       下载免费PDF全文

肖鹏飞  白登海  刘美  孔祥儒 《地震地质》2010,32(1):38

长周期大地电磁(LMT)是基于常规MT理论发展起来的电磁测深技术,青藏高原东部岩石圈较厚、视电阻率较低,应用LMT方法能够弥补常规MT仪器对低频信号响应的不足,获得有用的深部信息。文中概述了LMT的数据采集、处理及反演解释,并介绍了将LMT应用于东喜马拉雅构造结及其周围地区完成的长周期观测剖面——下察隅—玉树LMT剖面的岩石圈结构探测实例。实际观测表明,在重叠频段内LMT结果与常规MT具有良好的一致性;LMT数据处理实现的阻抗和倾子估计,在深部信息上具有更高的分辨率。LMT剖面结果揭示了青藏高原东部普遍存在地下低阻体,为局部地区部分熔融和地下流体存在的可能性提供了依据。LMT测深较好地弥补了常规MT方法在巨厚岩石圈和遇到低阻体时探测深度的局限性。  相似文献   

Estimation of the seismic assessment of residential and public buildings based on the data on the earthquake of August 27, 2008 in South Baikal   总被引：1，自引：0，他引：1  

Yu.?A.?BerzhinskyEmail author  L.?P.?Berzhinskaya  L.?I.?Ivan’kina  A.?P.?Ordynskaya  O.?I.?Salandaeva  L.?S.?Chigrinskaya  V.?V.?Akulova  E.?N.?Chernykh 《Seismic Instruments》2010,46(2):121-135

The intensity of the earthquake of August 27, 2008 registered 7–8 points on the MSK-64 scale at its epicenter. It was the strongest earthquake in the Pribaikalie in the last 50 years. The main causes of damage in buildings were the considerable depreciation of their construction and the low quality of the construction. The most typical macroseismic characteristics were the failures of brick chimneys and of ovens in one- and two-story wooden buildings.  相似文献   

Lowermost Mantle Velocity Estimations Beneath the Central North Atlantic Area from Pdif Observed at Balkan,East Mediterranean,and American Stations     

Marian Ivan  Daniela Veronica Ghica  Andrej Gosar  Panagiotis Hatzidimitriou  Rami Hofstetter  Gulten Polat  Rongjiang Wang 《Pure and Applied Geophysics》2015,172(2):283-293

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Determining return water levels at ungauged coastal sites: a case study for northern Germany   总被引：1，自引：0，他引：1  

Arne Arns  Thomas Wahl  Ivan D. Haigh  Jürgen Jensen 《Ocean Dynamics》2015,65(4):539-554

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Plasmaspheric electron density reconstruction based on the topside sounder model profiler     

Ivan Kutiev  Pencho Marinov  Anna Belehaki  Norbert Jakowski  Bodo Reinisch  Chris Mayer  Ioanna Tsagouri 《Acta Geophysica》2010,58(3):420-431

We apply a model-assisted technique to construct the topside electron density profile based on Digisonde measurements. This technique uses the Topside Sounder Model (TSM), which provides the plasma scale height, O⁺-H⁺ transition height, and their ratio Rt = H _T /h _T , derived from topside sounder data of Alouette and ISIS satellites. The Topside Sounder Model Profiler (TSMP) incorporates TSM and uses the model quantities as anchor points for the construction of topside density profiles. TSMP provides its model ratios with transition height and plasmaspheric scale height. The analysis carried out indicates that Digisonde derived F-region topside scale height Hm is systematically lower than one derived from topside sounder profiles. To construct topside profiles by using Hm, a correction factor of around 3 is needed to multiply the neutral scale height in the α-Chapman formula. It was found that the plasmaspheric scale height strongly depends on latitude and its ratio with the F-region scale height expresses large day-to-day variability.  相似文献   

Verification of the TSMP-assisted digisonde topside profiling technique     

Anna Belehaki  Ivan Kutiev  Bodo Reinisch  Norbert Jakowski  Pencho Marinov  Ivan Galkin  Chris Mayer  Ioanna Tsagouri  Themistocles Herekakis 《Acta Geophysica》2010,58(3):432-452

The purpose of this paper is to evaluate the performance of the TSMP-assisted Digisonde (TaD) topside profiling technique. We present systematic comparisons between electron density profiles and TEC parameters extracted from TaD model with (a) CHAMP-derived TEC parameters, (b) CHAMP reconstructed profiles, (c) ground based GPSderived TEC parameters, and (d) profiles reconstructed from RPI/IMAGE plasmagrams. In all cases, TaD follows the general trend of plasmaspheric observations derived from the above datasets. Especially during storm cases, TaD shows remarkable agreement with the variations of the ground based GPS-derived TEC parameters. Overall, the comparison results shows that TaD method can be adopted by EURIPOS to provide the electron density distribution up to plasmaspheric heights in real-time.  相似文献   

Two cosmological models for clusters of galaxies     

Ivan Suhhonenko  Mirt Gramann † 《Monthly notices of the Royal Astronomical Society》1999,303(1):77-86

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The 2dF Galaxy Redshift Survey: Wiener reconstruction of the cosmic web     

Pirin Erdo&#;du  Ofer Lahav  Saleem Zaroubi  George Efstathiou  Steve Moody  John A. Peacock  Matthew Colless  Ivan K. Baldry  Carlton M. Baugh  Joss Bland-Hawthorn  Terry Bridges  Russell Cannon  Shaun Cole  Chris Collins  Warrick Couch  Gavin Dalton  Roberto De Propris  Simon P. Driver  Richard S. Ellis  Carlos S. Frenk  Karl Glazebrook  Carole Jackson  Ian Lewis  Stuart Lumsden  Steve Maddox  Darren Madgwick  Peder Norberg  Bruce A. Peterson  Will Sutherland  Keith Taylor 《Monthly notices of the Royal Astronomical Society》2004,352(3):939-960

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