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.
N-Surveys
N-survey Napa Valley Seismic Project case studies
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.
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.
N2 – Oxbow Commons
Located at the Oxbow Commons in the Napa River overflow, this passive seismic survey achieved a depth of 42 meters. Total survey time was 1 hour.