The significance of pockmarks to understanding fluid flow processes and geohazards

Underwater gas and liquid escape from the seafloor has long been treated as a mere curiosity. It was only after the advent of the side‐scan sonar and the subsequent discovery of pockmarks that the scale of fluid escape and the moon‐like terrain on parts of the ocean floor became generally known. Today, pockmarks ranging in size from the ‘unit pockmark’ (1–10 m wide, < 0.6 m deep) to the normal pockmark (10–700 m wide, up to 45 m deep) are known to occur in most seas, oceans, lakes and in many diverse geological settings. In addition to indicating areas of the seabed that are ‘hydraulically active’, pockmarks are known to occur on continental slopes with gas hydrates and in association with slides and slumps. However, possibly their potentially greatest significance is as an indicator of deep fluid pressure build‐up prior to earthquakes. Whereas only a few locations containing active (bubbling) pockmarks are known, those that become active a few days prior to major earthquakes may be important precursors that have been overlooked. Pockmark fields and individual pockmarks need to be instrumented with temperature and pressure sensors, and monitoring should continue over years. The scale of such research calls for a multinational project in several pockmark fields in various geological settings.     

Big Game and Small Prey: Paleolithic and Epipaleolithic Economy from Valencia (Spain)

This study analyzes the faunal assemblages corresponding to the Middle and Upper Paleolithic and the Early Epipaleolithic for the central Spanish Mediterranean Region dated from between 135,000 and 9,000 B.P. To interpret these data, we employ a zooarchaeological and paleoeconomic perspective. Human large and small game hunting systems are analyzed through the identification of the origins of faunal assemblages, bone breackage patterns, and prey selection patterns. Our study shows that hunting systems changed significantly through time, which may be related to the characteristics of the Mediterranean ecosystem and, above all, to cultural changes.     

苏俄阿穆尔州与中国东北边境地区1917-1924年间的经贸关系

中华人民共和国主席江泽民说:"亲仁善邻,国之宝也.中俄世代的睦邻友好不仅是两国政治家的抉择,也是两国人民的共同心愿.中国是俄罗斯伟大的邻邦,我们两国之间有着传统的友谊."2000年7月17-19日,俄罗斯联邦总统普京访华时,两国元首同时认为,应十分重视两国的经贸合作,两国在这方面具有很大的潜力和互补性.     

Towards Robust Development of Retail Planning Policy: Maintaining the Viability and Vitality of Main Street Shopping Precincts

The deregulation of shopping hours has created a fluid environment where time-poor, affluent and mobile households can access shopping opportunities away from traditional retail precincts. The consequence has been the substantial decline of the viability and vitality of many main streets in eastern Australia. This greater temporal fluidity, however, requires stronger land use regulations if traditional town or suburb main streets are to maintain economic viability and social vitality. A suite of simple definitions of retail form are suggested and a number of assessment guidelines are proposed as meeting the requirements for more robust retail development assessment, including considerations of the geography of localities, place and the built form environment.     

Black-on-red ware in the levant: A neutron activation analysis study

Black-on-red ware was widely used throughout the Eastern Mediterranean between about the 11th and 8th centuries BC. Its origins have been much discussed: its ubiquitous appearance throughout the region could be a result of either several manufacturing regions or a single place of manufacture associated with considerable trading in the ware.In the present study, neutron activation analysis has been carried out for 15 chemical elements in 58 specimens of black-on-red ware from Cyprus (11), Syria (26) and Palestine (21). The analytical results clearly separate the ware into three major groups, corresponding to origins in Palestine, Syria and Cyprus. The hypothesis of a single source of the ware is therefore not tenable. All 14 of the Syrian finds of the single-handled neck ridge juglet are closely grouped with the Cyprus samples, indicating extensive trade in this vessel from Cyprus to Syria. The Palestine samples clearly separate into two sub-groups. Arguments are presented suggesting that this indicates the ware from the two sub-groups was made at different times. The Cyprus group provides tentative evidence of several sites of manufacture on the island.     

The charophyte Lamprothamnium succinctum as an environmental indicator: a Holocene example from Tom Thumbs Lagoon,eastern Australia

The palaeobiota from a middle to late Holocene succession in Tom Thumbs Lagoon, N.S.W., Australia, reflects a range of environmental conditions caused by sea-level changes and active estuarine sedimentation. At the base of the succession (～ ?0.4 m AHD) a thin bed, containing molluscs dated at 6.7 ka B.P. by radiocarbon and amino acid racemisation, and foraminifers is indicative of open estuarine conditions. From +0.35 m AHD towards the top of the sequence the charophyte Lamprothamnium succinctum occurs in subrecent deposits. This species is characterised here by statistical measurements, and new characters are described and illustrated. The charophytes record a drop in sea level and the establishment of a lower salinity artificial wetland. The investigation has also established that decalcification in charophytes can be related to acidification produced by the release of organic acids, aggravated after 1928 by anthropogenic pollution.     

THE IMPACT OF CRIME ON APARTMENT PRICES: EVIDENCE FROM STOCKHOLM,SWEDEN

This study uses data of about 9,000 apartment sales in Stockholm, Sweden, to assess the impact of crime on property prices. The study employs hedonic pricing modelling to estimate the impact of crime controlling for other factors (property and neighbourhood characteristics). Geographic Information System (GIS) is used to combine apartment sales by coordinates with offences, land use characteristics and demographic data of the population. The novelty of this research is threefold. First, it explores a set of land use attributes created by spatial techniques in GIS in combination with detailed geographical data in hedonic pricing modelling. Second, the effect of crime in neighbouring zones at one place can be measured by incorporating spatial lagged variables of offence rates into the model. Third, the study provides evidence of the impact of crime on housing prices in a capital city of a traditional welfare state, information otherwise lacking in the international literature. Our results indicate that apartment prices in a specific area are strongly affected by crime in its neighbouring zones, regardless of crime type. When offences were broken down by types, residential burglary, theft, vandalism, assault and robbery individually had a significant negative effect on property values. However, for residential burglary such an effect is not homogenous across space, and apartment prices in central areas are often less discounted by being exposed to crime than those in the city's outskirts.