In response to BO XIAN’s request for “felt like” info on the La Habra shake, I’ll throw in my 2 cents.
I live in Redondo Beach, CA, along the coast. So, I’m probably around 20 or so mile from La Habra and didn’t feel the full impact. With that in
mind, what I felt was a mild rolling/swaying motion. It wasn’t the jagged, sharp, horizontal/vertical displacements that many quakes produce. Then,
again, I guess it depends on how close you are to the epicenter as to the ground movement at the surface, and also the type of quake. I think this was
a blind thrust fault quake.. Anyway, it seemed to last approx 15-20 secs, and it caused me to feel quite disoriented/off-balance.
It reminded me of a quake that occurred around 15 years ago called the Hector Mine Quake. I was in Redondo Beach then, as well. Thing is, this quake
was centered in the Palm Springs/Twentynine Palms area, out in the desert east of LA, and a lot farther away than the La Habra quake. It was also a
LOT stronger, with a magnitude of 7.1. From where I was, though, all I felt was the same rolling/swaying/disorienting feeling of the La Habra shake.
Both times, the first thing to come to my mind was, “Man, somebody just got sucker-punched”.
It was funny: the Hector Mine quake, as I recall, happened around 2 or 3 in the morning. About 5 seconds into the rolling/swaying motion my phone
started ringing. It was my ex-wife, who was living in Palm Springs at the time. She was frantic and said the bed was violently moving back and forth
across the room. Definately in panic mode, she was in a state of blind fright. From where I was sitting, though, it was kinda funny. Trying to be cute
and diffuse the situation, all I could think to say was, “Don’t worry, Honey, we’ll get an Exorcist over to you right away...”. She was so
shook up, though, I don’t think she heard a word I said. That’s OK, at least I got a chuckle out of it
As far as tsunami’s go, there is one scenario that could result in a tsunami and cause a good deal of damage to Long Beach. It’s descibed in a USC
study of the stability of the Palos Verdes Peninsula. There’s an article about it HERE