Evidence for large earthquakes in metropolitan los angeles

The Sierra Madre fault, along the southern flank of the San Gabriel Mountains in the Los Angeles region, has failed in magnitude 7.2 to 7.6 events at least twice in the past 15,000 years. Restoration of slip on the fault indicated a minimum of about 4.0 meters of slip from the most recent earthquake and suggests a total cumulative slip of about 10.5 meters for the past two prehistoric earthquakes. Large surface displacements and strong ground motions resulting from greater than magnitude 7 earthquakes within the Los Angeles region are not yet considered in most seismic hazard and risk assessments.     

Carboxyhemoglobin concentrations in blood from donors in Chicago, Milwaukee, New York, and Los Angeles

To determine the carbon monoxide exposure experienced by the residents of Chicago, Los Angeles, Milwaukee, and New York, venous blood samples were obtained from adults at arbitrarily chosen blood bank collection sites in the four cities and analyzed for circulating carbon monoxide, carboxyhemoglobin. For comparative purposes, blood was obtained from volunteers breathing carbon monoxide-free air and was found to contain 0.45 percent carboxyhemoglobin. By contrast a high percentage of all the nonsmoking blood donors breathing city air had carboxyhemoglobin saturations greater than 1.5 percent, which indicated that exposure to carbon monoxide in excess of that permitted by the quality standards of the Clean Air Act of 1971 was widespread and occurring regularly.     

Predicting soil depth in a large and complex area using machine learning and environmental correlations

Soil depth is critical for eco-hydrological modeling, carbon storage calculation and land evaluation. However, its spatial variation is poorly understood and rarely mapped. With a limited number of sparse samples, how to predict soil depth in a large area of complex landscapes is still an issue. This study constructed an ensemble machine learning model, i.e.,quantile regression forest, to quantify the relationship between soil depth and environmental conditions. The model was then combined with ...     

Detection of large prehistoric earthquakes in the pacific northwest by microfossil analysis

Geologic and palynological evidence for rapid sea level change approximately 3400 and approximately 2000 carbon-14 years ago (3600 and 1900 calendar years ago) has been found at sites up to 110 kilometers apart in southwestern British Columbia. Submergence on southern Vancouver Island and slight emergence on the mainland during the older event are consistent with a great (magnitude M >/= 8) earthquake on the Cascadia subduction zone. The younger event is characterized by submergence throughout the region and may also record a plate-boundary earthquake or a very large crustal or intraplate earthquake. Microfossil analysis can detect small amounts of coseismic uplift and subsidence that leave little or no lithostratigraphic signature.     

The search for evidence of large prehistoric earthquakes along the atlantic seaboard

The spacial distribution of seismically induced liquefaction features discovered along the Atlantic seaboard suggest that during the last 2000 to 5000 years, large earthquakes (body wave magnitude, m(b) >/= 5.8 +/- 0.4) in this region may have been restricted exclusively to South Carolina. Paleoliquefaction evidence for six large prehistoric earthquakes was discovered there. At least five of these past events originated in the Charleston, South Carolina, area, the locale of a magnitude 7+ event in 1886. During the past two millennia, large events may have occurred about every 500 to 600 years.     

Irregular recurrence of large earthquakes along the san andreas fault: evidence from trees

Old trees growing along the San Andreas fault near Wrightwood, California, record in their annual ring-width patterns the effects of a major earthquake in the fall or winter of 1812 to 1813. Paleoseismic data and historical information indicate that this event was the "San Juan Capistrano" earthquake of 8 December 1812, with a magnitude of 7.5. The discovery that at least 12 kilometers of the Mojave segment of the San Andreas fault ruptured in 1812, only 44 years before the great January 1857 rupture, demonstrates that intervals between large earthquakes on this part of the fault are highly variable. This variability increases the uncertainty of forecasting destructive earthquakes on the basis of past behavior and accentuates the need for a more fundamental knowledge of San Andreas fault dynamics.     

Transmembrane helical interactions and the assembly of the T cell receptor complex

Studies of the subunit interactions of the multicomponent T cell antigen receptor (TCR) revealed that specific pairs of chains have the ability to assemble after transfection into fibroblasts. For one such pair, TCR-alpha and CD3-delta, their ability to assemble was encoded by their transmembrane domains. The specificity of this interaction suggests that well-defined helical interactions in the membrane can explain the assembly of some multichain membrane complexes.     

管道通过9度区和小江断裂的抗震设计

介绍了管道通过云南省寻甸县境内9度区和小江断裂的概况,提出了本区段管道的抗震设计方案,包括抗震目标、线路、站场、电力、通讯等系统各组成部分的校核结论,同时引进了地震监测和预警系统.从地震区域背景、性能目标和设防标准、设计方法和手段、材料选择、敷设方式、通信方式、地震监测和预警等方面,将本管道工程与阿拉斯加管道的抗震设计...     

大城市近郊田园综合体使用后评价

  目的  探索田园综合体规划设计中使用者的综合要求。  方法  以杭州市西湖区绕城村田园综合体为例,以大城市近郊乡村风光和乡村生活感知营造为出发点,利用使用后评价(post occupancy evaluation,POE)方法进行调研和信息反馈,对POE结论、各景观节点使用者的空间参与度和景观偏爱度等进行相关分析。  结果  ①使用者主要来自绕城村周边和杭州市区;②绕城村田园综合体主要用于日常休憩,短期或长期度假的仅占9.26%;③影响使用者对田园综合体满意度水平的主要因子为田园体验、景观风貌、人文风貌和配套服务设施,对满意度影响较大的是田园体验和景观风貌;④景观节点的乡村感知度与使用者偏爱度、使用者密度均呈正相关关系。  结论  景观规划设计不仅要保留和转译乡土元素,还需考虑使用者的来源和行为模式需求。图2表4参14     

NMR characterization of surface interactions in the cytochrome b5-cytochrome c complex

The complex formed in solution by native and chemically modified cytochrome c with cytochrome b5 has been studied by 1H and 13C nuclear magnetic resonance spectroscopy (NMR). Contrary to predictions of recent theoretical analysis, 1H NMR spectroscopy indicates that there is no major movement of cytochrome c residue Phe82 on binding to cytochrome b5. The greater resolution provided by 13C NMR spectroscopy permits detection of small perturbations in the environments of cytochrome c residues Ile75 and Ile85 on binding with cytochrome b5, a result that is in agreement with earlier model-building experiments. As individual cytochrome c lysyl residues are resolved in the 1H NMR spectrum of N-acetimidylated cytochrome c, the interaction of this modified protein with cytochrome b5 has been studied to evaluate the number of cytochrome c lysyl residues involved in binding to cytochrome b5. The results of this experiment indicate that at least six lysyl residues are involved, two more than predicted by static model building, which indicates that cytochrome c and cytochrome b5 form two or more structurally similar 1:1 complexes in solution.     

薄皮甜瓜大面积无公害高产栽培技术

本文较为详细地从选地与整地、播种、施肥、灌溉、整枝与留果及病虫害防治等方面介绍了薄皮甜瓜高产栽培技术。     

平原地区林农复合经营模式的探索

林业生态建设对维护国家生态安全和促进粮食生产都具有重要的意义。平原地区利用自身优势在营造农田防护林中采用林农复合经营模式，将会为农民增收、环境改善发挥重要作用。本文介绍了天津武清区多年来在林农复合经营模式上的方法和有益探索。     

黔南一次大范围暴雨天气成因分析

2020年7月18—19日黔南出现了一次大范围暴雨过程,州内12个县范围普降暴雨,通过利用MICAPS系统常规天气图、区域自动站资料和NCEP再分析资料,从环流形势、低层切变、地面系统以及暴雨条件等方面进行了分析。结果表明:该次过程是在对流层低层表现为高暖湿(θse高值)的环境特征时,受南、北支槽同相位引导小股冷空气自西北路径渗透影响和受兰州小高压推动地面较弱冷空气南下从贵州东部路径回流影响,在两路弱冷空气共同触发下,造成了黔南该年度范围最大的一次暴雨天气。     

Explosion effects and earthquakes in the amchitka island region

Microearthquakes were monitored by a network of seismographs located on Amchitka and nearby islands; the nature of earthquake activity in this region was found to be consistent with the hypothesis of underthrusting of the Aleutian arc by a rigid lithospheric plate. Seismic effects of the nuclear explosion Milrow were small, of short duration, confined to the region immediate to the explosion, and were apparently independent of this geotectonic mechanism.