<Dl> <Dd> v p = M / ρ (\ displaystyle v_ (p) = (\ sqrt (M / \ rho)) \) </Dd> </Dl> <Dd> v p = M / ρ (\ displaystyle v_ (p) = (\ sqrt (M / \ rho)) \) </Dd> <P> Typical values for P - wave velocity in earthquakes are in the range 5 to 8 km / s . The precise speed varies according to the region of the Earth's interior, from less than 6 km / s in the Earth's crust to 13.5 km / s in the lower mantle, and 11 km / s through the inner core . </P> <Table> Velocity of Common Rock Types hide <Tr> <Th> Rock Type </Th> <Th> Velocity (m / s) </Th> <Th> Velocity (ft / s) </Th> </Tr> <Tr> <Td> Unconsolidated Sandstone </Td> <Td> 4600 - 5200 </Td> <Td> 15000 - 17000 </Td> </Tr> <Tr> <Td> Consolidated Sandstone </Td> <Td> 5800 </Td> <Td> 19000 </Td> </Tr> <Tr> <Td> Shale </Td> <Td> 1800 - 4900 </Td> <Td> 6000 - 16000 </Td> </Tr> <Tr> <Td> Limestone </Td> <Td> 5800 - 6400 </Td> <Td> 19000 - 21000 </Td> </Tr> <Tr> <Td> Dolomite </Td> <Td> 6400 - 7300 </Td> <Td> 21000 - 24000 </Td> </Tr> <Tr> <Td> Anhydrite </Td> <Td> 6100 </Td> <Td> 20000 </Td> </Tr> <Tr> <Td> Granite </Td> <Td> 5800 - 6100 </Td> <Td> 19000 - 20000 </Td> </Tr> <Tr> <Td> Gabbro </Td> <Td> 7200 </Td> <Td> 23600 </Td> </Tr> </Table>

What is the approximate speed of p-waves traveling through earth's crust