Vertical Seismic Profile And Crossborehole Ground Penetrating Radar Measurements In Basalt Intraflow Structures

Vertical seismic profiles and cross-borehole ground penetrating radar experiments were carried<br>out in a basalt flow having a nearby outcrop exhibiting common intraflow structures (upper and<br>lower colonnades, and entablature). Results of velocity and attenuation analyses of the seismic<br>and radar data sets show clear differences between the different intraflow structures. Seismic<br>velocity (P and S) was highest and attenuation (P) lowest in the entablature and lower colonnade<br>compared to the upper colonnade. Radar velocity was highest and attenuation lowest in the upper<br>colonnade. Radar velocity was lowest and attenuation highest in the entablature. Radar velocity<br>and attenuation were intermediate in the lower colonnade.