140 smaller earthquakes recorded in area after big Napa Valley tremor

Workers survey a mound of toppled wine barrels that sit in a storage room at Kieu Hoang Winery on August 25, 2014, in Napa, California. Justin Sullivan/Getty Images

NAPA - San Francisco Bay Area residents who were shaken by Sunday morning's South Napa Earthquake haven't been given much of a chance to settle down, based on United States Geological Survey measurements of seismic activity in the area.

In the first 24 hours following the 3:20 a.m Sunday earthquake, the USGS recorded 124 minor quakes in the area, reports CBS San Francisco.

As of Tuesday morning, a total of 140 smaller earthquakes were measured.

The seismic activity is clustered around the epicenter and to the north near the Geysers, a region known for regular ground shaking. The largest of the tremors was 3.6 magnitude, just hours after the initial earthquake.

Many of the smaller quakes likely weren't felt by anyone, some measuring lest than a full magnitude point.

While damage from the big earthquake is still being assessed, some estimates put the economic loss at around $1 billion.

Still, officials in the area have said the damage wasn't catastrophic.

"Clearly, we are concerned that people are going to see that it was a catastrophe, and it certainly wasn't good, but it wasn't a catastrophe by any means," Clay Gregory, president of tourism organization Visit Napa Valley, said as workers at a shuttered downtown visitor's center updated lists of open wineries and surveyed hotels about cancellations. "The real story is that it has impacted a very small part of the valley."

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