NEW YORK, Sept 9 (Reuters) - Traders know that when President Donald Trump tweets he can rock financial markets, often in unpredictable ways, but analysts at JP Morgan have now quantified the impact of his tweets, at least on the U.S. interest rates market. Trump’s tweets, which have in recent months veered toward market-sensitive topics such as trade and monetary policy, have increasingly moved U.S. rates markets, analyst Munier Salem said in a note on Friday. In the report, which runs well over 4,000 words, J.P. Morgan analysts use machine learning techniques and their own volatility model to show how...