M 5.0 Rampart earthquake on April 1, 2003
On April 1, 2003 at 9:39 p.m. AKST, Interior Alaska residents were shaken by a M5.0 earthquake that occurred 16 miles SSE of Rampart at a depth of 10 miles (16 km). Although this earthquake was felt strongly throughout the area, no reports of any damage were received. Eight minutes after the main event, a M4.3 aftershock occurred in the same location. This earthquake was also felt strongly throughout Interior Alaska. Did you feel these earthquakes? Tell us about it.
As of 20:00:00 UTC, 04/02/2003 (11:00 a.m. AKST, 04/02/2003), the Alaska Earthquake Information Center has automatically located 6 aftershocks, all M2.0 or less.
The largest recorded earthquake in the Rampart seismic zone was a Ml 6.8 (mb 6.0, Ms 6.5) event that occurred on October 29, 1968. See a map of Interior seismicity.
| Mainshock Ml 5.0, mb 4.5 | Aftershock Ml 4.3, mb 3.9 |
| Preliminary earthquake paramaters: | |
| Time: 04/02/2003 06:39:39 UTC 04/01/2003 09:39 p.m. AKST |
Time: 04/02/2003 06:47:37 UTC 04/01/2003 09:47 p.m. AKST |
| Latitute: 65 N 17' Longitude 150 W 02' Depth 16 km (10 miles) | Latitute: 65 N 17' Longitude 150 W 01' Depth 16 km (10 miles) |
| First motions focal mechanism paramaters: | |
| strike1: 185.0 dip1: 83.0 rake1: 7.0strike2: 94.0 dip2: 83.0 rake2: 173.0 | strike1: 189.0 dip1: 60.0 rake1: -28.0strike2: 294.0 dip2: 66.0 rake2: -147.0 |
| See the mainshock focal mechanism | See the aftershock focal mechanism |
| Moment tensor inversion: | |
| See the mainshock moment tensor | See the aftershock moment tensor |
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