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1、Earthquake EngineeringNorway Seismic ArrayContentsIntroduction of Seismic Array1Original Construction and Development 2* A group of regularly arranged SeismometerAperture range in agreement with the length of observed seismic wave Output signal and Carry out various combinations analysisDepress the

2、interference of backgroundHighlight the usefulness of seismic signalAccess to information on the internal structure and the hypocenter*at least 3 same seismometers from 1 km to several hundred kilometers of aperture rangeTransmit the real-time output signal to a central computerProcess received data

3、 online to detect and localize regional or distant seismic eventKeep the data of interest for off-line analysis and data exchange* N O R S A RN O R E S SIntroduction of NORSARNORSAR, the earlist siesmic array of southen Norway, was built in 1970 according to government of Norway and the government o

4、f USA agreement signed. It was also a large aperture seismic array followed LASA of USA, aiming to detect the teleseismic events from 3000 to 10000 kilometers including nuclear explosion. It original consisted of 22 subarrays. The diameter of each subarray was about 8 km and the diameter of NORSAR i

5、s about 110 km. But 0nly 7 subarrays was working since 1976 because of high maintenance cost. The diameter of NORSAR became 60km.The Present NORSAR station configurationThe diameter of NORSAR is about 60 km. Each seismometer site is marked with a circle. The present NORSAR array has 42 sites. The NO

6、RSAR array has logically seven subarrays, each with six vertical seismometers. In addition, one site in each subarray (marked in green) has one three component broadband seismometer. The center seismometer of the NORSAR subarray 02B has the geographic coordinates 61.03972N, 11.21475E.The working Mec

7、hanism of NORSAR Each subarray of NORSAR is round. Each seismometer is placed in the basement or shallow wells.(3-15meter)Simulated value, outputted by each seismometer of subarray, is pre amplified, to the subarray center basement by underground cables. Then they are transmitted to digital synthesi

8、s signal via the filter and analog digital conversion. Finally these signal are modulate to Kjeller data processing cente by telephone line.Introduction of NORESSNORESS (Norwegian Regional Seismic Array System) was a small aperture seismic array that was built in 1985. NORES was initially establishe

9、d in southern Norway. Subsequently, ARCES was established in northern Norway. They were typical regional arrays. The NORES and ARCES-type array design of sites located on concentric rings (each consists of an odd number of sites) spaced at log-periodic intervals is now used for most of the modern sm

10、all aperture arrays; only the number of rings and the aperture differ from installation to installation.The Present ARCES station configurationThe ARCES is identical to the NORES array. Each vertical seismometer site is marked with a circle and a cross. The ARCES array has 25 sites with vertical sei

11、smometers. Four of these sites have in addition short-period horizontal seismometers. The short-period three-component sites are marked in blue or red. At the center site (red) a broadband three-component seismometer is collocated. The array has one center instrument ARA0 and four rings: the A-ring

12、with three sites and a radius of about 150 m, the B-ring with five sites and a radius of about 325 m, the C-ring with seven sites and a radius of about 700 m, and finally, the D-ring with nine sites and a radius of about 1500 m. The center seismometer of ARCES has the geographic coordinates 69.53486N, 25.50578E.Later Development of NORESSThe Spitsbergen array has only nine sites, e.g., and corresponds to the center site plus the A and t