Even though we come from earthquake country, the last thing that occurred to us was what had actually happened. At 11.45, a magnitude 4.2 quake (Erdbeben) hit between the Zugersee and Ägersee at a depth of either 30 km or 16 km, depending on whether you ask the Schweizerische Erdbebendienst (Swiss Seismological Service) or the USGS.
According to the earthquake-obsessed fool, it was actually two bangs, not one, and many residents reported the same on Earthquake-Report.com. Some reported that it felt like something big had run into their building, and some said it seemed like something had blown up nearby. A few residents reported a humming sound that preceded the quake, which seems fairly freaky to me.
OK, a 4.2 doesn't sound like much if you're from California. But in Switzerland the quakes usually measure below magnitude 2. That's good because we're not really equipped for a real quake here. Buildings are constructed here to convey a sense of solidity, as in solid concrete. But concrete, with its limited elasticity, is not necessarily the best material for withstanding an earthquake. A wooden house is often a better place to hang out in a quake; wood absorbs and dissipates the energy. If you're not in a liquefcation zone and the house has proper sheer walls, you're in good shape, at least up to a pretty high magnitude.
I wasn't able to find anything definitive on the state of earthquake engineering in Switzerland. But we had no real damage in our building and none has been reported so far in the region. I mean, 4.2—no biggie.