Seismicity and Seismic Risk in the Offshore North Sea Area : Proceedings of the NATO Advanced Research Workshop, Held at Utrecht, The Netherlands, June 1–4, 1982

The Workshop on the Seismicity and Seismic Risk in the Off­ shore North Sea Area was intended to bring together experts from a variety of disciplines as well as interest groups with involve­ ment in siting, design and construction of offshore structures in the region. Participants came from the fields of geology, seismology, oceanography, geotechnical and structural engineering and risk analysis. The wide range of participant affiliations included institutes, Observatories, universities, oil companies, consultants and insurance firms. All nationalities around the North Sea were present, in addition to some experts from outside the region. All participants were present on the basis of personal invitation. The idea of organizing the Workshop stemmed from conside- tions, such as: the rapidly increasing material and personel investments and versatility of type of structures in the basin.during the past decade; - the present-day important role Jf the North Sea oil and gas production in the economy of Western Europe; and - the increase of potential environmental risks in the region. Although devastating earthquakes are almost unknown in the area and seismic hazard is not great, the seismic risk grows with the growing size and number of structures in the area. The study of the potential seismic risks, therefore, cannot be neglected any more. The siting and design of offshore platforms and submarine pipelines are controlled by the degree of their vulnerability as well as the seismic hazard. in the region. Front Matter....Pages i-xxv Front Matter....Pages 1-1 Tectonics of the North Sea Basin and their Possible Relation to Historical Earthquakes....Pages 3-13 North Sea Seismotectonics and the Role of Geology in Offshore Seismic Risk Assessment....Pages 15-30 Constraints on Seismo-Tectonic Models for the North Sea....Pages 31-34 What Happens to the Rhine Graben ‘Sub-Plate Boundary’ Where it Meets the S. North Sea?....Pages 35-42 Geology and Tectonics. Panel Discussion. Introductory Remarks.....Pages 43-45 Possible Neotectonic Fault Movements in Norway....Pages 47-48 Back Matter....Pages 49-50 Front Matter....Pages 51-51 Seismicity of the North Sea Area....Pages 53-75 Some Problems Concerning the Seismicity of the North Sea Area....Pages 77-88 Non-Random Distribution of Earthquakes in the North Sea Basin Area....Pages 89-99 Seismicity and Neotectonic Structural Activity of the Rhine Graben System in Central Europe....Pages 101-111 Removal of Ghosts....Pages 113-114 Commentaires sur une Carte seismique de la Mer du nord et de la Mer de Norvege....Pages 115-120 Back Matter....Pages 121-123 Front Matter....Pages 125-125 Tidal Research and Seismicity....Pages 127-130 Changes of Relative Mean Sea-Level and of Mean Tidal Amplitude Along the Dutch Coast....Pages 131-141 Extreme Values of Wind Speed and Wave Height in the North Sea for Defining Design Criteria of Offshore Installations....Pages 143-148 Seaquakes, An Hazard to Offshore Platforms?....Pages 149-150 Back Matter....Pages 151-152 Front Matter....Pages 153-153 Instrumentation for North Sea Seismic Data Acquisition....Pages 155-171 Strong Motion Earthquake Data Acquisition and Processing....Pages 173-182 Ocean Bottom Seismic Instrumentation....Pages 183-185 Testing Methods Related to Soil and Structure Behaviour Under Dynamic Loading....Pages 187-194 Back Matter....Pages 199-199 Front Matter....Pages 153-153 Note on the Detection and Location Capability of The Netherlands Seismic Stations for Earthquakes in the North Sea Basin....Pages 195-197 Back Matter....Pages 199-199 Front Matter....Pages 201-201 Some Remarks on the Contribution of Geotechnical Engineering to an Estimation of Seismic Risk....Pages 203-218 Problems in Soil Mechanics and Earthquake Engineering in the North Sea....Pages 219-233 Seismic Data Requirements for the Design of Fixed Platforms in the Offshore North Sea Area....Pages 235-248 Evaluation of Stability of North Sea Sites....Pages 249-259 Seismology: A Geotechnical Engineer’s View Point....Pages 261-288 Testing for Liquefaction Potential....Pages 289-302 Modeling of Strong Ground Motion from Earthquakes in the North Sea Area....Pages 303-310 Back Matter....Pages 311-314 Front Matter....Pages 315-315 Evaluation of Seismic Risk....Pages 317-345 Seismic Risk and the North Sea....Pages 347-364 On Some Problems Concerning Seismic Risk Assessment for Offshore Structures in the North Sea....Pages 365-376 Uncertainty in U.K. Seismic Hazard Analysis....Pages 377-383 Methodological Aspects Encountered in the Lower Rhine Area Seismic Hazard Analysis....Pages 385-396 Outline of Procedure for Total Seismic Risk Estimation....Pages 397-404 Back Matter....Pages 405-420