Visualization of Northridge Aftershocks (Color)
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Visualization of main shock and aftershocks from the 1994 M 6.7 Northridge, California, earthquake during a period of 1.5 months starting from the main shock. The main shock and aftershocks are shown as spheres with radii proportional to magnitude and color-coded from lighter (small) to darker (large). Smallest event shown is magnitude 2.5. North is indicated by the arrow. The topography represents the San Fernando Valley and surrounding mountains. The fault plane derived from first motions is shown as a white mesh. The main shock is located at 18 km.