06-29-2015, 02:32 AM
the EQ was tectonic and not volcanic(due to movement of magma)...
I think that's an odd use of the term...
The earthquake was at a depth of about 8km, which is about the point of the decollement plane, i.e. the bottom of the volcano as it sits on the Earth, and most likely caused by the movement of the south flank of the volcano, not the underlying tectonic plate.
The question has always been are these earthquakes pushed, as if the pressure of magma within the volcano on one side (to the north) pushes the block of rock outward (to the south) or pulled but gravity as the unsupported southern flank of the volcano slips away. Though the end result, which is the widening of the East Rift Zone as the southern flank migrates south is still the same regardless of which force is at the root of the event.
So, if your friend is one of the gravity induced group I suppose it could be called tectonic, but still it was the volcano that moved, and that coupled with the fact that there was recently a large influx of magma in the area (just north of the epicenter) I'd place my bets on volcanic.
fyi.. a simplified drawing of a cross section of Kilauea Volcano along with a discussion of this topic can be found in a paper titled New insights into Kilauea's volcano dynamics brought by large-scale relative relocation of microearthquakes and read online here:
http://onlinelibrary.wiley.com/doi/10.10...02060/full
I think that's an odd use of the term...
The earthquake was at a depth of about 8km, which is about the point of the decollement plane, i.e. the bottom of the volcano as it sits on the Earth, and most likely caused by the movement of the south flank of the volcano, not the underlying tectonic plate.
The question has always been are these earthquakes pushed, as if the pressure of magma within the volcano on one side (to the north) pushes the block of rock outward (to the south) or pulled but gravity as the unsupported southern flank of the volcano slips away. Though the end result, which is the widening of the East Rift Zone as the southern flank migrates south is still the same regardless of which force is at the root of the event.
So, if your friend is one of the gravity induced group I suppose it could be called tectonic, but still it was the volcano that moved, and that coupled with the fact that there was recently a large influx of magma in the area (just north of the epicenter) I'd place my bets on volcanic.
fyi.. a simplified drawing of a cross section of Kilauea Volcano along with a discussion of this topic can be found in a paper titled New insights into Kilauea's volcano dynamics brought by large-scale relative relocation of microearthquakes and read online here:
http://onlinelibrary.wiley.com/doi/10.10...02060/full