An Oregon State engineering professor has been studying the "liquefaction" that happened during the Japanese earthquake. Scott Ashford says if its supported on shallow foundations or a mat foundation, you can get significant settlement. He says that settlement can tear out power and gas lines and cause landslides.
He also says Portland has soils similar to those in the Japans' quake area and would see the same impact.
Lane closures and detours Mt. WA Dr at Shevlin Park Road North to Regency (7/11-11/30)
Road closures along Roosevelt Ave >< Silver Lake Blvd -Chamberlain St. 7a-5p (9/6-11/20)
Valhalla Sewer Relocation Project, Mt. Washington Drive at Shevlin Park Road intersection and North to Regency Street. Nighttime closures with detours marked during roundabout construction. Daytime closures for construction towards Regency Street. 7 p.m. – 7 a.m., July – November.