Here is some interesting info concerning the Northern NV EQ swarm:
Note that these plots are of all earth quakes, not just those above 2.0. I initially thought that these quakes were just random events over time.
However, it appears that there are definite groupings of events, as well as relative quiet periods.
Click on the image to see the full size plot.
This is the scatter plot showing the events plotted as day vs. time:
Note that there are several days where the swarm of
quakes are sequential. Then there are periods of relative calm where there are no, or very few small events. Note the extreme increase of events
within the last 2 weeks.
This scatter plot shows the magnitude of the earth quakes plotted as day vs. time.
The magnitude is represented by the size of the bubble.
Note that this magnitude has been converted from the standard Richter magnitude scale to mega-joules in order to more accurately represent the size of
the quakes relative to the others in the swarm. Note that many of the smaller quakes which are indicated in the event scatter plot above are either
very tiny, or not visible at all. Also note the increase in size of the events over the last couple of weeks.
This bar chart represents the magnitudes of the quakes relative to one another plotted as a sequential series irrespective of when they occured.
Note that this chart indicates the events as a function
of their mega-joule energy and is presented in a logarithmic scale. Again, notice the increase of event magnitude within the last month or so.
This bar chart represents the depth of the EQ events in meters.
It is interesting to note that many of the Earth quake
events are listed as being at a depth of 0 km. It is also of interest that the depth of the events around the end of August increased before
returning to a shallower depth for the balance of the swarm. However, though it does not display the same grouping, there is a trend of incresing EQ
depth toward the end of the swarm as plotted here. This would also coincide with the increase in magnitude displayed in the other plots above.
Please note that I am a relative neophyte with respect to EQ analysis. However, one might come to the conclusion that the increase in both the
temporal density and event energy release might be predictive of a larger event in the near future.
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