IPA: /ˈsaɪz.mɪz.əm/
KK: /ˈsaɪzˌmɪzəm/
The phenomena related to earthquakes and seismic activity.
Scientists study seismism to understand how earthquakes occur.
Seismism is formed from "seismos" (Greek, meaning earthquake) and the suffix "-ism" (meaning a doctrine or belief). The term refers to the doctrine or study related to earthquakes and seismic activity.
Think of 'seismos' which means earthquake, and remember that 'seismism' relates to the study or belief about earthquakes.
No commonly confused words.