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Sep 10 at 10:29 comment added WillO I see now that I misread the question. You asked if an observer in the vicinity of Particle 2 is aware of the collapse, and I read you as asking if an observer in the vicinity of Particle 1 is aware of the collapse. So the above is the correct answer to a question you didn't ask. Fortunately @KenWharton was a more careful reader than I and answered your actual question.
Sep 10 at 1:51 comment added usernamedgreg Thank you! If I'm interpreting your response correctly, my scenario is not practical because of the distinctly separate observations of one particle vs the other - I'm looking at news articles like the below, how do you observe two particles simultaneously when they are 1200 kilometers apart? science.org/content/article/….
Sep 10 at 1:48 history answered WillO CC BY-SA 4.0