That was one of them, a long time to break through by anything other than a super volcano, which take time.Nothing to worry about, LA needs to be fixed up a bit, I would worry a bit more about the ones by "tom's Place" , those are right next to the "Long Valley" calderas, it goes and so would half of North America.
Latest Earthquakes
earthquake.usgs.gov
And further down the fault line.6.7 in Peru this evening
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Peru earthquake damages buildings and causes power cuts
A magnitude 6.7 earthquake struck the Ayacucho region on Thursday, the US Geological Survey says.www.bbc.com