3 ms·
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 seis
by bob1029 4y ago
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 4y agoThat's a fair point. I don't know but the graph is very heavy on the right.
- floxy 4y agoIt would be interesting to see the time series on the number of deployed seismometers from 1900 to the present.
- joxel 4y agoEarthquakes 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.
- citrin_ru 4y agoIf you don’t have enough sensors how do you distinguish between M<5 far away and M<5 in proximity?
- joxel 4y agoThe timing it takes for the P/S waves to reach you. One travels through the center, and the other travels along the surface of the earth. Here's a quick rundown: https://slcc.pressbooks.pub/physicalgeography/chapter/4-3/ https://slcc.pressbooks.pub/physicalgeography/chapter/4-3/
- maverwa 4y agoThe chart cites Wikipedia as the source. Maybe it’s just that earthquake after ~2000 tend to have a significant higher chance to be logged on Wikipedia compared to before? Wikipedia launched around 2001, so it would fit in that timeframe.
- tjohns 4y agoYeah, there's something very suspect about this data. Just off the top of my head, I'm quite sure there were more than 3 earthquakes with magnitude between 5.0 and 6.0 for the 80 year span between 1900 and 1980. Also, there's a notable discontinuity of exactly magnitude 7.0 earthquakes starting at the year 2000 that doesn't look like raw data.