N85 – 3rd Ave
Thick alluvium transitions to hard volcanics at depth, and a well on-site gives clues to the water table. One passive seismic survey collected data to a depth of 113 meters. Total survey time was 3 hours.
Stefan Burns
N84 – North Ave
An open pit at the neighbors provides snapshots of the volcanic rocks 3 meters below the surface. One passive-seismic survey collected data to 144 meters, total survey time was 2 hours.
N83 – Randolf Graves
Late night river survey with help from a geology enthusiast. One passive seismic survey collected data to a depth of 320 meters. Total survey time was 2 hours.
California Earthquakes – A Pattern
California has a complicated geologic history, and its patterns of earthquake is no different. Seismic events of incredible magnitude have shook the SF Bay Area for millions of years, and over the past 150 years, we’ve recorded an increasing number of these events. We must look to earthquake patterns in order to best predict the next “Big One”.
N81 – Napa Plums
A well on-site gives a clue to the water table. One passive seismic survey collected data to a depth of 62 meters. Total survey time was 1 hour.
N80 – Redwood Creek
Located next to Redwood Creek in Napa, two passive seismic surveys were done in order to get data to a depth of 155 meters. Total survey time was 3 hours.
N60 – Esther Deaver Park
Geologic outcrops from N77 give insights into the passive-seismic data here. One passive seismic survey collected data to a depth of 90 meters. Total survey time was 1 hour.
N34 – Browns Valley
First ever Fibonacci spiral passive-seismic survey. Good coherencies across a large number of spacings and pairs show the quality of data collected during Fib surveys. One passive seismic survey collected data to a depth of 67 meters. Total survey time was 1.5 hour.
N32 – Napa River
Sensors were placed on both sides of the Napa River for this survey. Data was observed to a depth of 155 meters. Total survey time was 1.5 hours.
N26 – Silverado School
Silverado School is located in the gently rolling volcanics of east Napa. Two passive-seismic surveys have been done thus far, and data has been collected from 7-270 meters. Total survey time 4 hours.