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Arenal Volcano History : Before the 1968 eruption, there were ten hours of powerful localized earthquakes.Most of the people in a lakeside town on the present site of the Arenal volcano national park visitor's center got scared and fled on foot to Santa Elena (Monteverde), where we had just come from. The folks who stayed behind were unlucky. The west side of the Arenal volcano blew out and emitted a cloud of gas at a temperature of 600 to 800 degrees C. This cloud destroyed 12 square kilometers. Then the caprock on the top of the volcano blew out and destroyed another 5 square kilometers.People come to the volcano today because there are usually mini-eruptions every day, each one accompanied by loud booms and glowing hot lava spilling down the sides of the cone.