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Arenal Volcano is a small (~1750 m above sea level, ~10 km3) stratovolcano that continuously erupted between July 1968 and October 2010. During this long-lasting eruption (over 42 yr), a large volume of material—~5.6 × 108 m3 of dense rock equivalent—has been extruded and has produced a thick and extended lava field, mainly on the western flank of the edifice. Measurements of ground deformation obtained using a network of dry-tilt stations are presented for the period 1986–2000. They show a continuous subsidence of the volcano with maximal amplitude on the western side. The load effect of...

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