What do the bubbles on the USGS earthquake map represent?

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A significant earthquake measuring 6.8 occurred offshore of Southeast New Ireland, Papua New Guinea, located 20 km ENE of Taron. The discussion includes a seismogram and a map from the USGS, which features "bubbles" representing various earthquakes over the years. The size of each bubble indicates the magnitude range of the quakes, with the map specifically detailing earthquakes of magnitude 4.5 and above from 1900 to 2015. The conversation emphasizes the frequency of seismic activity in the region, highlighting the historical context of earthquakes in Papua New Guinea.
davenn
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Hi all

This morning, another large quake. This time a M 6.8 just offshore of SE New Ireland, PNG

M 6.8 - 20km ENE of Taron, Papua New Guinea

my seismogram

zhi.gif
location map

New Ireland PNG.jpg
cheers
Dave
 

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What do all of the "bubbles" represent on this map from the USGS site?

qOZYXDL.png
 

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scottdave said:
What do all of the "bubbles" represent on this map from the USGS site?
lots and lots of quakes over the last x number of years, size of the dot represents magnitude range ... It may say how many years ... let me go look

hmmm doesn't seem to specifically say in the main text, but since they are constantly referring to how many M x.x sized big quakes since 1900, it may well cover all quakes M5 and up since 1900

Ahhh, found the map key

M4.5 and up 1900 - 2015

Dave
 
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