ICEARRAY: the first small-aperture, strong-motion array in Iceland |
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| Authors: | Benedikt Halldorsson Ragnar Sigbjornsson Johannes Schweitzer |
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| Institution: | (1) Earthquake Engineering Research Centre, University of Iceland, Austurvegur 2a, 800 Selfoss, Iceland;(2) NORSAR, P.O. Box 53, 2027 Kjeller, Norway |
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| Abstract: | A small-aperture, strong-motion array, the ICEARRAY, has been deployed in South Iceland, a region with a history of destructive
earthquakes, some exceeding magnitude 7. The array’s purpose is: (1) monitoring future significant events in the region, (2)
quantifying spatial variability of strong-motion over short distances and (3) shedding light on earthquake source processes.
The number of array stations and their arrangement were based on an optimisation of the shape of the corresponding array transfer
function (ATF). The optimal ICEARRAY configuration comprises 14 stations, has an aperture of ~1.9 km and a minimum interelement
distance of ~50 m and possesses a near-azimuthally independent ATF with a sharp main lobe, negligible sidelobes and a wavenumber
range of 1.5–24 rad/km. Accordingly, the ICEARRAY has the intended capabilities of capturing seismic waves in the frequency
range of 1–20 Hz, which is of main interest to earthquake engineering and engineering seismology applications. |
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| Keywords: | ICEARRAY Small-aperture Strong-motion Array Iceland Earthquake South Iceland Seismic Zone Spatial variability Correlation Transfer function |
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