▁more ▁than ▁ 5 0 0 ▁t uf a ▁sp ires , ▁some ▁as ▁high ▁as ▁ 1 4 0 ▁feet , ▁rising ▁from ▁the ▁bed ▁of ▁the ▁S ear les ▁Lake ▁bas in . ▁ ▁The ▁name ▁Tr ona ▁is ▁derived ▁from ▁the ▁min eral ▁tr ona , ▁abund ant ▁in ▁the ▁lake . ▁ ▁The ▁local ▁school ▁plays ▁on ▁a ▁d irt ▁football ▁field ▁because ▁the ▁high ▁level ▁of ▁salt ▁k ills ▁grass . ▁▁ 2 0 1 9 ▁earth qu akes ▁In ▁July ▁ 2 0 1 9 ▁S ear les ▁Valley ▁was ▁impact ed ▁by ▁a ▁series ▁of ▁earth qu akes , ▁the ▁principal ▁events ▁( with ▁magn itudes ▁of ▁ 6 . 4 , ▁ 5 . 4 , ▁and ▁ 7 . 1 ▁) ▁occurr ing ▁from ▁ 1 2 ▁to ▁ 1 8 ▁kilom eters ▁west ▁on ▁the ▁Naval ▁Air ▁We ap ons ▁Station ▁China ▁Lake . ▁The ▁earth qu ake ▁series ▁started ▁at ▁ 1 0 : 0 2 ▁A . M . ▁July ▁ 4 ▁with ▁ 4 . 0 ▁earth qu ake ▁ 4 ▁kilom eters ▁south west ▁of ▁S ear les ▁Valley . ▁At ▁ 1 0 : 3 3 ▁A . M . ▁a ▁third ▁earth qu ake ▁struck , ▁the ▁biggest ▁of ▁the ▁series ▁– ▁a ▁ 6 . 4 ▁magnitude ▁ 1 2 ▁kilom eters ▁south west ▁of ▁S ear les ▁Valley . ▁The ▁earth qu ake ▁was ▁felt ▁throughout ▁the ▁area ▁and ▁Southern ▁California , ▁including ▁Los ▁Angeles