金曜日セミナー（9月15日） Abhijit Ghosh 氏Earthquakes come in many flavors. Regular garden-variety earthquakes are short (seconds to minutes), characterized by fast fault slip (m/sec) and can potentially be very damaging. On the other hand, slow earthquake can last for months to years and characterized by slow slip (mm/day) on the fault. In addition, there are other phenomena like seismic swarm, fault creep, by which fault release stress. How these different behaviors are connected, if at all, is not clear. There are growing evidence that fast and slow earthquakes are related, but their mode of communication remains enigmatic. I present new observations of slow and fast earthquakes in different plate boundary settings from different parts of the world to better understand their physical mechanism, and governing physics in an attempt to elucidate fault dynamics in a holistic way.