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Can there be 2 earthquakes?

It's quite possible for two earthquakes with different epicenters to occur at nearly the same time. If the epicenters are close enough, some areas will experience both earthquakes at the same time.

earthscience.stackexchange.com - Can two earthquakes happen at the same time?
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The 2016 paper "A case for historic joint rupture of the San Andreas and San Jacinto faults" reports of research suggesting that simultaneous large earthquakes occurred in 1812 in California, the researchers used dynamic rupture modeling to show that paleoseismic and historic observations associated with the earthquake of 8 December 1812 can be explained by joint rupture of the SAF and SJF.

(SAF = San Andreas Fault and SJF = San Jacinto Fault)

But the author stresses that what they have is a model, rather than a certainty. Alot of research centres around the notion of 'near-simultaneous earthquakes', such as the 2009 South Pacific earthquake, as described in the article "Double Shake: Multiple, Nearly Simultaneous Earthquakes Triggered Deadly 2009 Tsunami" where studies suggest that at least 2 quakes of similar magnitude occurred within 50km of eachother, separated by minutes - another similar study suggests that one of the quakes 'obscured' another nearby rupture of equal or higher magnitude. It's very important to consider this scenario of earthquakes, occurring possibly seconds apart, one immediately after another Stating that this scenario would have an 'amplification' effect of the the effects of the shhaking (hence, the researchers' concern). A particular example they cite is The 1980 Irpinia earthquakes included a sequence of three events, occurring at intervals within 20 seconds of each other. Another compelling example, reported in the article "Sumatran strike-slip earthquakes challenge seismologists" that occurred in April, 2012 - a strike-slip fault induced quake of a magnitude of 8.6 on the richter Scale, one of the theories for the great magnitude is explained as Another apparent reason for the large magnitude, says Miaki Ishii, a sesimologist at Harvard University, is that multiple faults appear to have slipped almost simultaneously, creating a composite earthquake. “If it was just a single fault activation, it wouldn’t have been large as 8.6. An important note the Harvard seismologist makes, that essentially answers your question regarding simultaneous (and near-simulatneous earthquakes), is that observations of this kind of fault activation, which is described as "a cascading failure of faults" are seen in a lot of large earthquakes.

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Even as the first person to use force, it's possible to act in self-defense. If a reasonable person would think that physical harm is in the immediate offing, the defendant can typically use reasonable force to prevent the attack. People don't have to wait until they've actually been struck to act in self-defense.

Even as the first person to use force, it's possible to act in self-defense. If a reasonable person would think that physical harm is in the immediate offing, the defendant can typically use reasonable force to prevent the attack. People don't have to wait until they've actually been struck to act in self-defense. On the other hand, they can't use ostensibly preventative force without good reason. (For more on defenses to crimes, see Defenses to Criminal Charges. For information on unreasonable use of force in potential self-defense scenarios, see Imperfect Self-Defense.) Example: Attila and Genghis begin arguing after their cars collide. The argument gets heated, and Attila suddenly lifts his arm and forms his hand into a fist. Thinking that Attila is about to hit him, Genghis quickly knocks Attila to the ground and twists his arm behind his back. Under these circumstances, a reasonable person would think that Attila was about to hit Genghis. Because people don't have to wait to be hit before protecting themselves, Genghis acted in self-defense and isn't guilty of a crime. In fact, an officer could arrest Attila for assaulting Genghis (making Genghis fear that he was about to be hit.) (See Assault and Battery.) Example: Popeye sees Bluto walking down the street. They've had a few scuffles in the past. Though Bluto is paying no attention to Popeye, Popeye has a hunch that his adversary may trip him when walking by. To prevent this, Popeye socks Bluto. Popeye doesn't have a valid self-defense claim, because the circumstances wouldn't suggest to a reasonable person that Bluto was about to attack him.

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