The Los Angeles area’s groundwater ... seismic waves can be used to track groundwater levels. While measuring groundwater usually requires drilling deep wells — at a price point of $100,000 ...

The greater Los Angeles area has long ... Ellsworth was surprised to see how well the minute changes in seismic wave speeds can be measured to monitor groundwater levels. "The match is remarkable ...

The series of late-winter storms that brought much needed rain to the region last week raised the total volume of stormwater captured by Los Angeles County to 11.9 billion gallons just weeks ...