I operate three stations on the Raspberry Shake seismic network, R4989 in Orono, ME, R6A3B in Poland, ME, and RCB43 in Williamstown, MA, USA. I also maintain the University of Maine, Orono Seismometer for the New England Seismic Network.
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All three Raspberry Shake geophones, and the UMO seismometer, are located in the seismically quiet New England region of the United States. The UMO seismometer is located in the University's seismic vault in Orono, ME, on large glacial boulder pavement close to bedrock. R4989 is located on glacial outwash sediments, an unknown distance from bedrock. R6A3B, the station in Poland, ME, is located on the carapace of a glacial drumlin, likely within two meters of bedrock. RCB43 is located on fluvial terrace and glacial Lake Bascom sediments, likely ~2-4m from bedrock. Stations further from bedrock are much more sensitive to surface wave noise from things like passing vehicles. Small seismic events have been observed nearby, and major earthquake events (magnitude 6.5+) from around the world are detected at all of these stations.
Availability plot for today, 2019/04/19
Plots are updated every ten minutes. New day's plots may not be available between 00:00 and 00:15 UTC. All three Raspberry Shake stations are located in basements about 50-100 feet from residential streets. Vehicles driving by at speed account for a large portion of the spikes seen in the data. Other potential sources of noise include washer/dryer vibration, indoor foot traffic, and cars entering and exiting the driveway. In the winter, snowplow noise may be the largest source of vibration detected at these stations on a given day. During the warmer months, lawnmower noise may be evident as well. The anthropogenic noise sources generally fall in the 10-20Hz range of the frequency spectrum as observed at this station. Earthquakes, should they be detected, will likely cover a larger (and lower) portion of the observable spectrum than the rest of the noise sources.
Plots rendered at 2019/04/19 17:14:53 UTC.
Page loaded at 2019/04/19 17:15:16 UTC.
Plot selectionNE.ORNO - Orono, Maine || AM.R4989 - Orono, Maine || AM.R6A3B - Poland, Maine || AM.RCB43 - Williamstown, Massachusetts
Currently viewing plots for: AM.R6A3B.00.EHZ
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Recent earthquake catalog.
Spectrogram of the past five minutes (unfiltered):A plot of energy density at given frequencies over time. Spectrogram z-axis (color) units are dimensionless.
Low frequency bandpass (0.7-2 Hz for RShakes, 0.03-0.1 Hz for broadbands):
24 hr helicorder plot (UTC):
Low frequency bandpass helicorder plot (good for observing faraway quakes):
Local seismicity rate by week:
These plots are made with a combination of ObsPy and Matplotlib formatting. The spectrogram above scales based on the density of energy at the given frequency, based on a moving window with an overlap of 0.9/1. The helicorder plot resets every day at 0000hrs UTC. Traces plotted on the helicorder are scaled down by 800 and 70 respectively for readability, although this is subject to change as I get more familiar with the signatures of environmental noise that the geophone picks up.