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  • Fisheries  (14,417)
  • Chemistry  (4,605)
  • Inorganic Chemistry
  • SPACE SCIENCES
  • Seismicity
  • 2020-2022  (14,920)
  • 1945-1949  (3,680)
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  • 1
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    La sismicità storica dell'isola senza terremoti (2020)
    INGV
    Details
    Publication Date: 2020-12-18
    Description: probably confirm this opinion, with qualifica ons. Historical earthquake catalogues, up to CPTI11 [Rovida et al., 2011], report only one Mw 5.1 event on 13 November 1948: it was located in the Sardinian Sea, and had very modest effects on land. In later decades, the seismic networks did record very few earthquakes of moderate energy (Mw 〈5), mostly located off-shore, either south-east of Cagliari or west of Olbia or in the Sea of Sardinia. The most recent ones (occurred in 2000, 2004 and 2006) had very slight effects on the island. Given the low level of instrumental seismicity and the weak macroseismic effects of known historical earthquakes, Sardinia's seismic risk is perceived as very low. The low seismicity of the region certainly has a geological explana on, given that the Corsica-Sardinia block is among the most stable areas of the Mediterranean basin. “Low”, however, does not mean “non- existent”: recent historical research has improved knowledge on the major known historical earthquake of Sardinia (it occurred on June 4, 1616 and was responsible for minor but widespread damage to the system of coastal watchtowers, south-west of Cagliari) and rediscovered several minor earthquakes, part of which were known to the seismological tradi on but had been almost completely forgo en. This paper collects all the documenta on available at present on the seismic history of Sardinia.
    Description: Published
    Description: 1-160
    Description: 4T. Sismicità dell'Italia
    Description: JCR Journal
    Keywords: Sardinia ; Seismicity ; Seismic history ; Historical Earthquakes ; Historical seismology ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
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    From mapped faults to fault-length earthquake magnitude (FLEM): a test on Italy with methodological implications (2020)
    Details
    Publication Date: 2020-12-15
    Description: Empirical scaling relationships between fault or slip dimensions and earthquake magnitudes are often used to assess the maximum possible earthquake magnitude of a territory. Upon the assumption of the reactivability of any fault, the earthquake magnitudes derived from the surface fault length (FLEM) are compared at the national scale in Italy against catalogued magnitudes. FLEMs are obtained by considering a comprehensive fault dataset regardless of fault age, stress field orientation, strain rate, etc. In particular, (1) a comprehensive catalogue of all known faults is compiled by merging the most complete databases available; (2) FLEM is then derived from fault length; and (3) the resulting FLEMs are compared (i.e. the mathematical difference) with catalogued earthquake magnitudes. Results show that the largest FLEMs as well as the largest differences between FLEMs and catalogued magnitudes are observed for poorly constrained faults, mainly inferred from subsurface data. It is suggested that these areas have to be further characterized to better estimate fault dimension and segmentation and hence properly assess the FLEM. Where, in contrast, the knowledge of faults is geologically well constrained, the calculated FLEM is often consistent with the catalogued seismicity, with the 2 value of the distribution of differences being 1.47 and reducing to 0.53 when considering only the Mw 6:5 earthquakes. Our work highlights areas, in Italy, where further detailed studies on faults are required.
    Description: Published
    Description: 1555–1579
    Description: 4T. Sismicità dell'Italia
    Description: JCR Journal
    Keywords: Italy ; Seismicity ; Itaalian seismicity
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 3
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    Earthquakes in Switzerland and surrounding regions during 2017 and 2018 (2021)
    Springer
    Details
    Publication Date: 2021-02-12
    Description: This report summarizes the seismicity in Switzerland and surrounding regions in the years 2017 and 2018. In 2017 and 2018, the Swiss Seismological Service detected and located 1227 and 955 earthquakes in the region under considera- tion, respectively. The strongest event in the analysed period was the ML 4.6 Urnerboden earthquake, which occurred in the border region of cantons Uri, Glarus and Schwyz on March 6, 2017. The event was the strongest earthquake within Switzerland since the ML 5.0 Vaz earthquake of 1991. Associated ground motions indicating intensity IV were reported in a radius up to about 50 km and locally approached intensity VI in the region close to the epicentre. Derived focal mechanisms and relative hypocentre relocations of the immediate aftershocks image a NNW–SSE striking sinistral strike-slip fault. Together with other past events in this region, the Urnerboden earthquake suggests the existence of a system of sub-parallel strike-slip faults, likely within in the uppermost crystalline basement of the eastern Aar Massif. A vigorous earthquake sequence occurred close to Château-d’Oex in the Préalpes-Romandes region in western Switzer- land. With a magnitude of ML 4.3, the strongest earthquake of the sequence occurred on July 1, 2017. Focal mechanism and relative relocations of fore- and aftershocks image a NNE dipping normal fault in about 4 km depth. Two similarly oriented shallow normal-fault events occurred between subalpine Molasse and Préalpes units close to Châtel-St-Denis and St. Silvester in 2017/18. Together, these events indicate a domain of NE–SW oriented extensional to transtensional deformation along the Alpine Front between Lake Geneva in the west and the Fribourg Fault in the east. The structural complexity of the Fribourg Fault is revealed by an ML 2.9 earthquake near Tafers in 2018. The event images a NW–SE striking fault segment within the crystalline basement, which might be related to the Fribourg Fault Zone. Finally, the ML 2.8 Grenchen earthquake of 2017 provides a rare example of shallow thrust faulting along the Jura fold-and-thrust belt, indicating contraction in the northwestern Alpine foreland of Switzerland.
    Description: Published
    Description: id 4
    Description: 4T. Sismicità dell'Italia
    Description: JCR Journal
    Keywords: Seismicity ; Focal mechanisms ; Seismotectonics ; Urnerboden ; Aar Massif ; Château-d’oex ; Préalpes ; Fribourg ; Jura fold-and-thrust belt ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 4
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    How well does known seismicity between the Lower Rhine Graben and southern North Sea reflect future earthquake activity? (2020)
    Details
    Publication Date: 2021-03-29
    Description: Since the 14th century, moderate seismic activity with 14 earthquakes of magnitude MW≥5.0 occurred in Western Europe in a region extending from the Lower Rhine Graben (LRG) to the southern North Sea. In this paper, we investigate how well this seismic activity could reflect that of the future. The observed earthquake activity in the LRG is continuous and concentrates on the Quaternary normal faults delimiting the LRG, which are also the source of large surface rupturing Holocene and Late Pleistocene earthquakes. The estimated magnitudes of these past earthquakes range from 6.3±0.3 to 7.0±0.3 while their average recurrence on individual faults varies from ten thousand to a few ten thousand years, which makes foreseeing future activity over the long-term possible. Three of the largest historical earthquakes with MW≥5.5 occurred outside the LRG. Late Quaternary activity along the fault zones suspected to be the source of two of these earthquakes, i.e. the 1580 Strait of Dover and 1692 northern Belgian Ardennes earthquakes, is very elusive if it exists. Hence, similar earthquakes would be very infrequent at these locations suggesting that the seismicity outside of the LRG would be episodic and clustered on some faults during periods of a few hundreds of years interrupted by long periods of inactivity typically lasting for some tens to hundreds of thousand years. Seismic moment release estimation and its comparison between recent geological and historical seismicity periods lead us to suggest that the high seismicity level observed between AD 1350 and AD 1700 west of the LRG would be uncommon.
    Description: research
    Keywords: 551.22 ; 550 ; e-docs::Geophysik ; Seismicity ; Earthquake ; Fault zone ; Historical earthquake ; Holocene ; FID-GEO-DE-7
    Language: English
    Type: article_first
    Format: 20
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  • 5
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    Standardization of mesh size in codend of the Miankaleh Beach Seine (2020)
    Details
    Publication Date: 2021-05-19
    Description: Beach seine is fishing gears that occupy all depths of water from surface to bed by non-gillnet net. Increasing non-standard catches caused this survive was done to standardization of the beach seine mesh size. The research was started from winter of 2017 to spring of 2017, performing 73 hauling with four mesh sizes of 26, 28, 30 and 33 mm (knot to knot) in the bag area of ​​the beach seine in Miankaleh region of Golestan Province. According to the mesh size used in the bag section, the results showed that the highest amount of catches from different mesh size was done in size of 26 mm. Also, the maximum lengths were found for Liza aurata, Risso, 1810 in different mesh size in the 30-35 cm class length and for Alosa caspia, Linck, 1790 for 35-40 cm and for Rutilus kutum, Kamensky, 1901 at 30 to 35 cm. Also, in the mesh size of 26 mm, 50 percent of Lisa fish was caught at the length of 24.87 centimeters, in mesh size of 30 mm, 25.66 centimeters and mesh size of 32 mm, 26.65 centimeters. Also, the length of 50% of the permitted catch was obtained 25.5 centimeters by using 30 mm mesh size. According to the results, it was found that the Beach seines in the region did not caught selective and did catch much fish below the standard length.
    Description: Published
    Keywords: Alosa caspia ; Fisheries ; Beach seine ; Catch ; Mesh size
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.13-21
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  • 6
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    Salmonid & freshwater Fisheries statistics England & Wales 1992 (2021)
    National Rivers Authority | Bristol, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10949 | 1256 | 2013-03-26 13:57:52 | 10949 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-25
    Description: This is the Salmonid & Freshwater Fisheries Statistics for England & Wales 1992 produced by the National Rivers Authority (NRA) in 1994. This report is focused on the maintenance, improvement and development of fisheries of England and Wales. This report is the fourth compilation of salmon and migratory trout catch statistics for England and Wales published by the National Rivers Authority. For the years 1983-88, these statistics were published by the Ministry of Agriculture, Fisheries and Food (MAFF), Directorate of Fisheries Research in their Data Report Series. Other than for rod catches, the 1992 data have been presented in a broadly similar format to those of 1991, Presentation of the rod data however has changed considerably due to the introduction in January 1992 of the first National Rod Fishing Licence. This report makes a general review of different catches: Northumbria, Yorkshire, Anglian, Thames, Southern, Wessex, South West, Severn-Trent, Welsh and North West.
    Description: Environment Agency Archives North West
    Keywords: Fisheries ; Limnology ; Management ; England ; Wales ; Northumbria ; Yorkshire ; Anglian ; Thames ; Southern ; Wessex ; South West ; Severn-Trent ; Welsh ; North West ; Inland waters ; Rivers ; River fisheries ; Freshwater fish ; Fishery management ; Fishery data ; Fish catch statistics ; Migratory species ; Licensing
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 51
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  • 7
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    Salmonid & freshwater Fisheries statistics England & Wales 1994 (2021)
    National Rivers Authority | Bristol, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10950 | 1256 | 2013-03-26 13:57:26 | 10950 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-25
    Description: This is the Salmonid & Freshwater Fisheries Statistics for England & Wales 1994 produced by the National Rivers Authority (NRA) in 1995. This report is focused on the maintenance, improvement and development of fisheries of England and Wales. This report is the sixth compilation of salmon and migratory trout catch statistics for England and Wales produced by the National Rivers Authority. For the years 1983-88, these statistics were published by the Ministry o f Agriculture, Fisheries and Food (MAFF), Directorate of Fisheries Research in their Data Report Series. The 1994 data have been presented in a broadly similar format to those of 1993.This report makes a general review of different catches: Northumbria, Yorkshire, Anglian, Thames, Southern, Wessex, South West, Severn-Trent, Welsh and North West.
    Description: Environment Agency Archives North West
    Keywords: Fisheries ; Limnology ; Management ; England ; Wales ; Northumbria ; Yorkshire ; Anglian ; Thames ; Southern ; Wessex ; South West ; Severn-Trent ; Welsh ; North West ; Inland waters ; Rivers ; River fisheries ; Freshwater fish ; Fishery management ; Fishery data ; Fish catch statistics ; Migratory species ; Licensing
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 57
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  • 8
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    Roy of the Rivers (cartoon) (2021)
    National Rivers Authority South West | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10954 | 1256 | 2013-03-26 13:56:29 | 10954 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-25
    Description: This is the Roy of the Rivers (cartoon) report produced by the National Rivers Authority (NRA) South West Region. This NRA document is a leaflet comic format which looks at the fishing and safe issues in rivers. This comic highlights the community policing to help guard the water environment. It gives a 24 hour emergency number and three steps to be followed in case of pollution, dead, distressed fish or suspects someone of illegally catching or selling fish.
    Description: Environment Agency Archives North West
    Keywords: Fisheries ; Limnology ; Management ; England ; NRA ; Inland waters ; Rivers ; Poaching ; Freshwater pollution
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 3
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  • 9
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    River Ehen and tributaries SSSI (2021)
    Environment Agency North West | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10956 | 1256 | 2013-03-26 13:56:11 | 10956 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-25
    Description: This is the River Ehen and Tributaries SSSI consultation Protocol for the Environment Agency with English Nature, produced in 1998. The Protocol is intended to provide for consistency of approach, to clarify responsibilities and help to streamline the statutory consultation and consenting procedures in which both organisations are involved. It provides guiding principles on the approach to management issues. Based on the operations likely to damage the special interest (OLDSI) which forms part of the SSSI notification, the protocol identified acceptable management activities which contribute to the special interest of the site and those which may adversely affect that interest. OLDSI includes activities such: land drainage consents, discharge consents, herbicides approvals, fish-stocking consents, fishing licences, abstraction and impoundment licences, consents to construct/test pump boreholes, integrated pollution Control Licences and Waste Management Licences, capital projects, flood defence maintenance works, water resources, fisheries, pollution control, ecology surveys and Recreation works.
    Description: Environment Agency Archives North West
    Keywords: Fisheries ; Limnology ; Management ; England ; Ehen catchment ; Inland waters ; Rivers ; Freshwater lakes ; Nature conservation ; SSSI ; OLDSI ; Freshwater pollution ; water quality
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 29
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  • 10
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    River Leven (at Newby Bridge) freeze coring report (2021)
    Lancaster Universtiy | Lancaster, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10958 | 1256 | 2013-03-26 13:55:54 | 10958 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-25
    Description: This is the River Leven (at Newby Bridge) freeze coring report produced by Lancaster University in 2000. This study looks at fine materials in river Leven that may have to be considered detrimental to successful salmonid spawning. Following an observed decline in quality of salmonid fisheries at the site an investigation was initiated to assess the extent of ingress of fine sediments into the spawning gravels. A broader picture was sought by sampling both above and below the weir and close to both banks of the river. A comparison of the fine sediment from each sample site was undertaken. All the freeze cores used in this report contained distinct horizontal strata down through their length. The cores often penetrated into a highly compacted layer of light grey coloured material. The upper surface of this highly compacted layer is considered as a boundary between fine materials of different origin. Considerable variability was observed in the median grain size (D50) of the gravels from the cores. In addition variability was observed in the thickness of the upper less compacted layers. The role of regulated river flow across the weir in clearing fines from river gravels is briefly considered.
    Description: Environment Agency Archives North West
    Description: +appendices
    Keywords: Fisheries ; Limnology ; Management ; England ; Leven ; Inland waters ; Rivers ; Freshwater fish ; Migratory species ; Sediment cores ; Environmental assessment ; Water quality
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 17
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