摘要:

The mean sea level along the coasts of the Skagerrak, the Kattegat, and the Danish Straits—i.e., the transition area between the North Sea and the Baltic Sea—has been computed geodetically. The basis consists of mean sea level data from Denmark, Norway, and Sweden in various more or less inappropriate height systems. These are transformed and unified into a common height system relevant for oceanographic purposes to show the deviation of the mean sea level (1960) from the mean geoid, with Normaal Amsterdams Peil (NAP) as zero. The geodetically determined mean sea surface is compared with oceanographic model results for parts of the area. Among other findings, the outflow of low‐salinity water from the Baltic Sea, as well as its separation from high‐salinity North Sea water along the Kattegat‐Skagerrak front are clearly revealed.

ISSN:0149-0419    

DOI:10.1080/15210609409379724

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Multibeam (Hydrosweep) swath bathymetric investigations revealed the presence of a NNW trending linear seamount chain along the axial part of the Laxmi Basin in the eastern Arabian Sea, between 15°N, 70°15'E and 17°20'N, 69°E. This chain consists of three major edifices: RAMAN1and PANIKKAR2seamounts and WADIA2guyot. These seamounts are elongated in plan and have heights and basal areas varying between 1068–2240 m and 300–1210 sq km, respectively. Steep lower flanks, flat plateaus, terraces, secondary peaks, and an extensive dendritic gullie pattern are the identified characteristic morphological features of these seamounts. The origin of these seamounts is attributed to anomalous volcanism resulting from the intersection of the Reunion hotspot with an extinct spreading center.

ISSN:0149-0419    

DOI:10.1080/15210609409379725

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

This work focuses on some currently used high‐degree geopotential models that represent the gravity field in Spain. Six test areas of different topographic structures that cover the greatest part of the territory are selected to get information on the gravity field. A number of 27,691 free‐air gravity anomalies and three geopotential models are considered in this work. Comparisons of free‐air and geopotential models‐implied anomalies are studied in the test areas and in all of Spain. The results show that the model IFE88E2 is the most suitable for use as a reference field in the region of Spain.

ISSN:0149-0419    

DOI:10.1080/15210609409379726

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

A theoretical model of tsunami generation and propagation near an oceanic island is developed in this paper. The solution is computed by means of a method that is basically analytical and that synthesizes waveforms as a superposition of normal modes whose evolution is governed by the linearized shallow‐water equations. Sea‐bottom deformations are computed analytically via the classic dislocation theory applicable to plane faults with uniform slip. Initial sea‐surface elevations are assumed to be equal to floor displacements. The ocean basin circling the islands is supposed to have a depth depending only upon the distance from the island center. Tsunami propagation is computed in the whole basin with particular attention to the wave invading the island coasts. It is seen that a typical open‐ocean radiation pattern combines with diffracted wavefronts and wavefronts progressing around the island that tend to persist for a longer time after the first tsunami attack. These local island waves are particularly interesting because they extend the tsunami menace even to the coastline segments potentially protected from the main tsunami attack.

ISSN:0149-0419    

DOI:10.1080/15210609409379727

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Variations of the annual mean sea level are studied from the observed data at the tide gauge stations in the northwestern Pacific. A glance of the tectonic condition helps in realizing the local specific variations in the interested area. Variations of the Kuroshio flow off the stations are also considered as a possible contaminant factor for the next tsunamigenic earthquake.

ISSN:0149-0419    

DOI:10.1080/15210609409379728

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

ISSN:0149-0419    

DOI:10.1080/15210609409379729

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

ISSN:0149-0419    

DOI:10.1080/15210609409379730

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

ISSN:0149-0419    

DOI:10.1080/15210609409379723

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor