Yes, it was centered around the middle of the forehead. I had a high pitched tone in my right ear several times over the last couple days too.

As for how this all started for me, I never correlated this until after the Northridge quake. Five hours before it happened I was up entering sweepstakes. That was my passtime at that time. I had an awesome headache and decided after midnight to head for the grocery store, a Ralph's in Encino. I thought maybe a break would relieve the headache a bit. Then I could come back and finish the sweepstake entries that had to be in by the end of that month. Strange thing about it was that I bought things that I normally wouldn't buy; batteries of all sizes, candles, sardines, a can of those dolmas (grape leaves stuffed with rice or meat), a couple pints of beer. I got home , put my groceries away and went back to the sweepstake entries. At 4:00 am I decided to lay down on a sleeping bag on the floor in the living room (I had no bed at that time). It was only 31 minutes later that the bouncing began. I couldn't have been too deeply asleep and heard everything bouncing on the shelves. I couldn't imagine what was going on, but bounced up and then things started moving side to side. My filing cabinet drawers were opening and closing and then everything started spilling off of the shelves. I thought that it must have been the big one, but no.

My boss' husband was a photographer and we spent the next day driving around looking at the damage; he was taking pictures and I was smoking something without fear that the police were not busy enough to give me a ticket (Note: I don't do it anymore). We saw Diane Feinstein at Reseda Park looking at the people who had to camp out. The whole time, we could feel the ground beneath us rippling with the aftershocks going on the first day.

Eventually, I realized that I could tell which days would have aftershocks above 3 magnitude. I would get a dizzy feeling, like a sense of movement or loss of equilibrium. Whenever I got those feelings, I would look at the pool, You could always tell when a real aftershock happened by the way the ripples started to move chaotically over the pool. So, I knew that when I got that feeling, there was nothing going on at that time, but there was within several hours. This went on for a long time, as did the aftershocks.

The next time that I got a real bad headache happened to be a day in September of I forget what year, but later in the day there was a swarm of several 5 magnitude quakes at Ridgecrest (the biggest was a 5.8) and I could feel them where I worked in Tarzana. This is when I found that the part of my head that hurt was facing the same direction as the activity. In this case I was facing south and the back left side of my head throbbed the most. I was starting to notice some kind of trend. No one can ever convince me that I'm imagining it. I have been experimenting with it ever since, trying to find the limits and what different sensations mean. I also found that at times of emotional upset, this sensitivity can be thrown off or be overshadowed by the other things going on. But if people just leave me alone and I get deep into whatever I am doing, it can be amazingly accurate.

Also I must say that, I look at it as some kind of universal force that fits into some universal laws. Since we are all individuals and made different, it may affect each person differently. Any person that is open to the universal forces may experience things that they never thought possible. I could go on about this, but fear that my religious beliefs may cause more problems here than are worth mentioning. I will leave it at that.

More if I think of something to add later,

Steven T. @ Tarzana, CA