New Earthquake Risk for California: The Garlock Fault Could Produce M8 Earthquakes A major California fault line is shifting for the first time in history, triggered by the series of earthquakes that shook Southern California in July. This is surprising, because we’ve never seen the Garlock fault do anything. Here, all of a sudden, it changed its behavior. We just don’t know what it means. https://www.youtube.com/watch?v=IWS6klUHfjQ #news