By tracking swarms of very small earthquakes, seismologists are getting a new picture of the complex region where the San Andreas fault meets the Cascadia subduction zone, an area that could give rise to devastating major earthquakes.

Along the remote coast where the San Andreas Fault meets the Cascadia subduction zone, earthquakes too small for humans to feel are sketching out a hidden map of danger. By tracking these tiny tremors,

Southern California's Coachella Valley experienced over 150 earthquakes within a 24-hour period, with USGS warning of continued activity for a week.

Over the last few days, the Coachella Valley has experienced more than 20 earthquakes, causing concern among some residents.

After yet another notably sized earthquake struck near Indio overnight, following two days of seismic activity, renowned seismologist Dr. Lucy Jones says that even more temblors could head to the area due to its proximity to the San Andreas Fault system.

The San Andreas Fault is the longest and fastest-moving, but over the next decade, Dr. Lucy Jones says it'll probably be one of the lesser-known faults that causes the most damage. CBS LA's Laurie Perez talks to Dr.

Scientists say the temblor, which was followed by a magnitude 3.5 aftershock, is unlikely to lead to larger event.

Seismic tremors reveal a shallow fragment of ancient tectonic plate beneath Northern California, helping explain damaging earthquakes near the surface.