https://earthquake.usgs.gov/monitoring/spectrograms/24hr/95/20260407
Spectrograms | MMNB DP1 BP 40 (Middle Mountain, Parkfield, Ca) - Tue Apr 7, 2026
USGS Earthquake Hazards Program, responsible for monitoring, reporting, and researching earthquakes and earthquake hazards
https://earthquake.usgs.gov/monitoring/spectrograms/24hr/95/20240515
Spectrograms | MMNB DP1 BP 40 (Middle Mountain, Parkfield, Ca) - Wed May 15, 2024
USGS Earthquake Hazards Program, responsible for monitoring, reporting, and researching earthquakes and earthquake hazards
https://earthquake.usgs.gov/monitoring/spectrograms/24hr/95/20260409
Spectrograms | MMNB DP1 BP 40 (Middle Mountain, Parkfield, Ca) - Thu Apr 9, 2026
USGS Earthquake Hazards Program, responsible for monitoring, reporting, and researching earthquakes and earthquake hazards
https://earthquake.usgs.gov/monitoring/spectrograms/24hr/95/20260415
Spectrograms | MMNB DP1 BP 40 (Middle Mountain, Parkfield, Ca) - Wed Apr 15, 2026
USGS Earthquake Hazards Program, responsible for monitoring, reporting, and researching earthquakes and earthquake hazards
https://earthquake.usgs.gov/monitoring/spectrograms/24hr/95/20260410
Spectrograms | MMNB DP1 BP 40 (Middle Mountain, Parkfield, Ca) - Fri Apr 10, 2026
USGS Earthquake Hazards Program, responsible for monitoring, reporting, and researching earthquakes and earthquake hazards
https://earthquake.usgs.gov/monitoring/spectrograms/24hr/95/20240913
Spectrograms | MMNB DP1 BP 40 (Middle Mountain, Parkfield, Ca) - Fri Sep 13, 2024
USGS Earthquake Hazards Program, responsible for monitoring, reporting, and researching earthquakes and earthquake hazards
https://earthquake.usgs.gov/monitoring/spectrograms/24hr/95/20260416
Spectrograms | MMNB DP1 BP 40 (Middle Mountain, Parkfield, Ca) - Thu Apr 16, 2026
USGS Earthquake Hazards Program, responsible for monitoring, reporting, and researching earthquakes and earthquake hazards