Tagged: seismic lensing

Herald infographic: hard rock may have worsened tremor - Visibly Shaken

Aimee Whitcroft Feb 25, 2011

Hard basalt rock under the Port Hills, near Lyttelton, may have compounded the effect of Tuesday’s earthquake by reflecting more seismic activity back at Christchurch. Like sound waves, seismic waves can be reflected, absorbed or dispersed, with hard surfaces reflecting them. Being reflected back towards the city in this way might also explain why there are such marked differences in … Read More