[HN Gopher] Timeseries of earthquakes with M = 5 or greater (2011)
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       Timeseries of earthquakes with M = 5 or greater (2011)
        
       Author : sfc32
       Score  : 10 points
       Date   : 2023-02-06 19:17 UTC (3 hours ago)
        
 (HTM) web link (ocean.si.edu)
 (TXT) w3m dump (ocean.si.edu)
        
       | bob1029 wrote:
       | Perhaps we simply got better at detection?
       | 
       | > Modern recording equipment has been in use since about 1900.
       | 
       | What is the difference in sensitivity between a seismometer made
       | in ~1900 vs 2023?
        
         | sfc32 wrote:
         | That's a fair point. I don't know but the graph is very heavy
         | on the right.
        
           | floxy wrote:
           | It would be interesting to see the time series on the number
           | of deployed seismometers from 1900 to the present.
        
             | joxel wrote:
             | Earthquakes can be sensed from basically anywhere, only the
             | time it takes the P/S waves to travel to you are different,
             | especially if the quake is M>5.
             | 
             | More sensors don't really add more detections, but are
             | useful for pinpointing an origin.
        
       | sfc32 wrote:
       | Frequency of serious earthquakes seems to be increasing.
        
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       (page generated 2023-02-06 23:01 UTC)