August 23, 2011 6:10 pm Philly Geologist Talks Quake The Franklin Institute’s Chief Astronomer Derrick Pitts, who is also a geologist, explains why we here in Philly felt the Va. earthquake and why aftershocks happened. US & World Videos 2:54 UPenn leaders reiterate to pro-Palestinian protesters that they need to disband 1:44 Pro-Palestinian protesters remain on UPenn's campus despite warnings to disband 1:30 Protests calling for ceasefire continue at Penn 6:33 Family affair: Former Eagle and new Eagle Jeremiah Trotter and Jeremiah Trotter Jr. speak out 0:20 Teen girl shot in Southwest Philly, suspect in custody