What do the bubbles on the USGS earthquake map represent?

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M 6.8 earthquake occurred just offshore of SE New Ireland, PNG this morning. He also mentions that the "bubbles" on the USGS map represent the frequency and magnitude range of earthquakes over the last x number of years, with the size of the bubble representing the magnitude range. The map key shows that the bubbles represent all earthquakes of M4.5 and up since 1900. In summary, Dave is discussing the recent M 6.8 earthquake and explaining the meaning of the bubbles on the USGS map.
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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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1. What caused the M 6.8 Quake in New Ireland, PNG?

The M 6.8 Quake in New Ireland, PNG was caused by the movement of tectonic plates. The region is located along the Ring of Fire, where the Australian Plate and the Pacific Plate meet, making it prone to seismic activity.

2. How strong was the earthquake?

The M 6.8 Quake in New Ireland, PNG had a magnitude of 6.8 on the Richter scale. This means it was considered a strong earthquake and could potentially cause significant damage.

3. Was there any damage or casualties from the earthquake?

At the time of this writing, there have been no reports of damage or casualties from the M 6.8 Quake in New Ireland, PNG. However, it is still important to monitor the situation and take necessary precautions in case of aftershocks.

4. How common are earthquakes in New Ireland, PNG?

Earthquakes are fairly common in New Ireland, PNG due to its location along the Ring of Fire. The region experiences frequent seismic activity, with earthquakes ranging from small tremors to larger ones like the recent M 6.8 quake.

5. Is there a risk of a tsunami following the earthquake?

Based on current information, there is no immediate risk of a tsunami following the M 6.8 Quake in New Ireland, PNG. However, it is important to stay alert and follow any warnings or instructions from local authorities.

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