By examining the morphologies of lava flow structures on Ascraeus Mons, geologists are able to calculate the rheological properties of the lava and estimate the rate at which it poured out during eruption (effusion rate). Results show that the lava was highly fluid (low viscosity) with low yield strength, resembling Hawaiian and Icelandic basaltic lavas. Average effusion rates are about 185 m3/s. These rates are comparable to those seen in Hawaii and Iceland. Earth-based radar studies show that Ascraeus Mons has a higher radar echo strength than other volcanic structures on the planet. This could indicate that the lava flows on the flanks of Ascraeus Mons consist of rough ʻAʻā-type flows, a conclusion supported by photogeologic analysis of lava flow morphologies.