The 1908 Messina Strait earthquake in the regional geostructural framework     

A. Bottari  E. Carapezza  M. Carapezza  P. Carveni  F. Cefali  E. Lo Giudice  C. Pandolfo 《Journal of Geodynamics》1986,5(3-4)

The original historical data from surveys of the damage caused by the great Calabro-Messina earthquake are analyzed in detail. This analysis allows the macroseismic field to be reconstructed in a way more compatible with a modern scientific viewpoint, laying maximum importance on indications supplied by the MSK intensity scale.A geometrical model of the focus has been worked out, adopting in part the schemes proposed by Shebalin. This model, together with the macroseismic field parameters, is correlated with the regional structural parameters. Finally, in their quest for better knowledge of the regional seismotectonic pattern, the authors search for evidence of geodynamic consistency by analyzing a spatio-temporal period in the neighborhood of the event.  相似文献   

On the boundary-layer flow over a Canadian Archipelago polynya     

Aloysius Kou-Fang Lo 《Boundary-Layer Meteorology》1986,35(1-2):53-71

A numerical model is presented for predicting boundary-layer parameters for flow over a polynya, i.e., an isolated lead of open water that recurs annually at the same geographical location during Arctic winters. As the flow encounters a polynya, it experiences a sudden change from a cold, dry, rough, snow-covered ice surface to a warmer, wetter, and smoother open water surface. The present model includes both the heat balance equation and the vapor conservation equation in addition to the usual mass continuity equation, x-momentum equation, and the turbulent energy equation. In addition, the buoyancy term is added to the energy equation to account for the buoyancy force introduced by the underlying warmer surface. To close the system, the present model uses the Glushko-type mixing length relationship. During the numerical calculations, a fully implicit finite-difference method was used, and stable numerical solutions were obtained for a fetch over 1 km. Comparison of model results with measured results over a polynya in the Canadian Archipelago show good agreement.  相似文献   

Book reviews     

W. R. Stanley  H. Tietze  C. P. Lo  B. Hartung-Kagi  R. O. Whyte  W. U. Ehrmann  A. G. Koestler  A. Wallner 《GeoJournal》1987,14(2):277-280

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Seasonal agricultural land use patterns in China's Pearl River Delta from multi-date landsat images     

Chor-pang Lo Ph. D.  Clifton W. Pannell Ph. D. 《GeoJournal》1985,10(2):183-195

Landsat images of the Pearl River delta region of SE China were interpreted manually in combination with other data sources to identify, measure and to map agricultural land use in a 25,775 km² study area during three growing seasons of 1978. Areal measurements for different land uses were compiled. Paddy lands, which accounted for 6,340 km², were evaluated and classified on the basis of quality, yield and production. Rice production for the study area was then estimated at 5.9 million metric tons based on average yields for the different grades of paddy land.  相似文献   

Highly fractionated I-type granites in NE China (I): geochronology and petrogenesis   总被引：43，自引：0，他引：43  

Fu-yuan Wu  Bor-ming Jahn  Simon A. Wilde  Ching-Hua Lo  Tzen-Fu Yui  Qiang Lin  Wen-chun Ge  De-you Sun 《Lithos》2003,66(3-4):241-273

Northeastern (NE) China is the easternmost part of the Central Asian Orogenic Belt (CAOB), which is celebrated for its accretionary tectonics and the world's most important juvenile crust production in the Phanerozoic era. Abundant granitoids occur in the Great Xing'an, Lesser Xing'an and Zhangguangcai Ranges in NE China. This paper presents partial results of a series of studies on the granitoids from this region, aiming to understand their role in the building of new continental crust in eastern Asia. Three composite granite plutons (Xinhuatun, Lamashan and Yiershi) were chosen for geochemical and isotopic study in order to determine their emplacement ages and petrogenesis. Petrographically, they range from granodiorite (minor), monzogranite, syenogranite to alkali-feldspar granite. Quartz and perthitic feldspar are principal phases, accompanied by minor amounts of plagioclase, biotite (<5%) and other accessory minerals. In addition, many contain abundant miarolitic cavities which suggest that they were emplaced at shallow levels with extensive fractional crystallization. Geochemically, the granites are silica-rich, peraluminous and have high contents of alkalis. They invariably show enrichment in light rare earth elements (LREE) and significant negative Eu anomalies. All the granitic rocks demonstrate the characteristic negative anomalies in Ba, Nb, Sr, P, Eu, and Ti, and a positive anomaly in Pb in the spidergram.

The emplacement of the Xinhuatun pluton took place at 184±4 Ma as revealed by zircon SHRIMP U–Pb data. This is also supported by the slightly younger Rb–Sr whole-rock (WR) isochron age of 173±3 Ma. A whole-rock (WR) Rb–Sr isochron age of 154±3 Ma was obtained for the Lamashan pluton, which is interpreted as close to the time of emplacement. The Yiershi pluton was intruded at about 140 Ma as evidenced by a zircon U–Pb age of 137±2 Ma and WR Rb–Sr isochron age of 143±5 Ma. Biotite-WR Rb–Sr isochrons and ⁴⁰Ar/³⁹Ar ages of feldspars allow us to estimate the cooling rate of each pluton.

Geochemical data suggest that the rocks are highly fractionated I-type granites. Fractionation of biotite and feldspars was the principal process of magmatic differentiation and responsible for major element variation. Rb, Sr and Ba concentrations were controlled by feldspar separation, whereas REE elements were fractionated by accessory minerals, such as apatite, allanite and monazite.  相似文献   

Dispositivo per la raccolta dei gas nell’interno dei crateri vulcanici inaccessibili e profondi     

G. Ponte 《Bulletin of Volcanology》1940,7(1):51-52

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Quantitative regional analysis of Chu Chiang Delta area of South China using landsat images     

C. P. Lo Dr. 《GeoJournal》1982,6(3):231-240

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Earthquake-induced gravitational potential energy change in the active Taiwan orogenic belt     

Chung-Liang Lo  Shu-Kun Hsu 《Geophysical Journal International》2005,162(1):169-176

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Dating palaeo‐seismic faulting in the Taiwan Mountain Belt          下载免费PDF全文

Chih‐Tung Chen  Chieh‐Yu Wu  Ching‐Hua Lo  Hao‐Tsu Chu  Tzen‐Fu Yui 《地学学报》2018,30(2):146-151

In‐situ ⁴⁰Ar/³⁹Ar laser microprobe dating was carried out on the Hoping pseudotachylite from a mylonite‐fault zone in the metamorphosed basement complex of the active Taiwan Mountain Belt to determine the timing of the responsible earthquake(s). The dating results, distributed from 3.2 to 1.6 Ma with errors ranging from 0.2 to 1.1 Ma, were derived from a combination of two Ar isotopic system end‐members with inverse isochron ages of 1.55 ± 0.05 and 2.87 ± 0.07 Ma, respectively. Petrographical observations reveal fault melt containing ultracataclasites, therefore the older inverse isochron end‐member may be attributed to the relic wall rock Ar isotopic system contained in micro‐breccia. Without significant Ar loss expected, the ~1.6 Ma for the young end‐member defines the exact time of the pseudotachylite formation. Seismic faulting therefore occurred during basement rock exhumation in the Taiwanese hinterland.  相似文献   

Experimental study of cohesive sediment consolidation and resuspension identifies approaches for coastal restoration: Lake Lery,Louisiana     

Edward L. Lo  Samuel J. Bentley Sr.  Kehui Xu 《Geo-Marine Letters》2014,34(6):499-509

The purpose of this study was to evaluate related processes of sediment consolidation and resuspension in a coastal basin and how these processes influence retention of fine sediment delivered by a river diversion. Sediment samples were collected from Lake Lery, a coastal receiving basin of the Caernarvon Diversion from the Mississippi River, Louisiana. Consolidation was tested for six initial sediment concentrations (14.0–105 kg m^–3) in a settling column over 15-day periods. Mud erodibility was tested at seven shear stress regimes (0.01–0.60 Pa) using a dual-core Gust erosion microcosm system, on cores containing suspensions that consolidated for 1, 2, and 4 weeks. Consolidation rates were found to be inversely and exponentially related to initial suspension concentration, over concentrations ranging from fluid mud (10–200 kg m^–3) to hydraulic dredge effluent. Consolidation is best predicted by a function consisting of two exponential terms and one asymptotic constant, describing rates of rapid initial and slower subsequent settling. Coupled resuspension and consolidation tests (concentrations of 20–21 kg m^–3) show that shear stresses generating the highest turbidity peaks increase from ≤0.30 Pa after 2 weeks of consolidation to ≥0.45 Pa after 4 weeks, and this strengthening cannot be attributed solely to increasing sediment concentration over time. Comparison of measured erosion shear stresses with bed shear stresses typical of coastal lakes and bays suggests that this degree of strengthening, if given time to occur, could increase the overall retention of fine sediments deposited on lake and bay floors.  相似文献