Table 1.

Top 15 topics on Reddit after the M6.4 foreshock using GPU-PDMM. Topics on Twitter can be found in⁷.

Topic type	Keywords
Description	Earthquake fault get go area would quake place time people stress see much really say give event lot good shake
Self-rescue	Fall get building thing shake run build work wall house hope good head safe break shelf floor old table damage
Description	Feel think go shake start bed move back first thing still sleep see wake realize look sway car sit whole
Description	Move right state sound road snow run ground side high cool see cause water earth look get mountain place entire
Description	Feel shake second long pretty roll last good get strong wave minute bit way definitely little sway floor check slow
Insurance	Water fire go house emergency home gas power store stuff line keep need damage buy use insurance open lot work
Negative	Get go live say think see still look guy thing right would feel back fuck die love work family friend
Forum	Post question comment thank use look ask link bot action concern report try help source rule moderator remove new find
Description	Earthquake big time happen quake year live really know first even people say one never day also much make ever
NBA	Play well amp game good would go start think take use probably money team make none time late give card
Southern CA	Quake area say big damage aftershock magnitude also epicenter time far large report hit mile people small southern chance
Negative	Earthquake people know make even see shit take watch happen say fuck post let news movie sure probably really seem
Alert	Would want alert app work may way give could point set warn send use put get actually shake maybe location
Nuclear	Fault would could large think magnitude see test energy likely scale major plate look weapon release nuclear show event cause
Description	Good place food go get find way live well great pretty new thing still taco much city try eat bad