ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Seismograph recording activity of the Merapi volcano, Java, Indonesia in October 1999. This device detected and recorded ground movements (seismic activity), which in this case are due to an active volcano, in the volcanological observatory near the city of Yogyakarta. The observatory was destroyed by pyroclastic explosions in October 2010.
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