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Many people might not associate Saudi Arabia with volcanoes and earthquakes. A more common image might be miles upon miles of sandy desert. However, the Arabian region is home to some large fields of volcanoes that have erupted in the last thousand years or so. In May 2009, 40,000 people were evacuated from the Harrat Lunayyir province in northwest Saudi Arabia in response to a series of earthquakes, some over magnitude 5, in case larger, more damaging quakes were to come. In response to this, the Saudi Geological Survey invited the US Geological Survey to help investigate not only whether more, larger quakes could occur, but also if this could signal volcanic eruptions in the region. A recent paper in Nature Geoscience documents the scientific investigations that followed (Pallister, et al., 2010).