The Minor Bay Area Earthquake of March 30, 2009 – a 4.3 on the Richter Scale

That didn’t feel so bad in the 415. A little scary at first, for a second or two. After that you could tell it wasn’t going to be a big deal…

Magnitude 4.3
Date-Time
  • Monday, March 30, 2009 at 17:40:29 UTC
  • Monday, March 30, 2009 at 10:40:29 AM at epicenter
Location 37.285°N, 121.620°W
Depth 6.2 km (3.9 miles)
Region NORTHERN CALIFORNIA
Distances
  • 18 km (11 miles) N (7°) from Morgan Hill, CA
  • 19 km (12 miles) E (91°) from Seven Trees, CA
  • 20 km (13 miles) ESE (117°) from Alum Rock, CA
  • 25 km (16 miles) ESE (104°) from San Jose City Hall, CA
Location Uncertainty horizontal +/- 0.1 km (0.1 miles); depth +/- 0.3 km (0.2 miles)
Parameters NST=250, Nph=250, Dmin=7 km, Rmss=0.08 sec, Gp= 58°,
M-type=duration magnitude (Md), Version=1
Source
Event ID nc40234037

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4 Responses to “The Minor Bay Area Earthquake of March 30, 2009 – a 4.3 on the Richter Scale”

  1. My house located near 280 & 17 started to shake at 10:40am – I figured it was around a 4 pointer. It felt like someone ran into the house with a car going about 60 miles and hour.

  2. Nikki says:

    It felt pretty bad in downtown san jose, what is the likelihood of an aftershock or worse quake following this one?

  3. sfcitizen says:

    60 mph? Sounds serious.

    Up here in S.F., you’d think maybe a heavy truck was going by for the first half second or so. People are remarking that it felt like it came and then went and then came again over the course of five seconds….

    thx for posting. stay safe…

  4. sfcitizen says:

    I’d say the chances of any kind of signif. aftershock in the near future are very low.

    But if you extend your time horizon over the next 30-50 years, well it would seem the Big One is a coming….