Mac Sudden Motion Sensor: Obtaining activation state

Very similar to [this SuperUser question](https://superuser.com/questions/139647/is-the-macbook-sudden-motion-sensor-logged) , I'd like to know if there's a way to know when the SMS is actually *engaged*. Note that I **do not** want to know if the sensor is *enabled* (which can be done from the Terminal with sudo pmset -g). **Specifically I want to know when the sensor trips and forces the hard drive's head to park, and when it senses the danger is clear and allows the head to move again.** In an ideal case a Growl notification would be fantastic, but even a log would suffice. I ask because as [Apple notes on their support page](http://support.apple.com/kb/HT1935) , the SMS can be tripped in certain environments such as nightclubs when it would be undesirable. However the only way to **know** if you are in such an environment is by guessing since I haven't found a way to tell the frequency or length of time the SMS actually causes head parks. I understand the simple thing to do is disable the sensor outright, but the point of the question is how to gain visibility into the *actual* activity of the sensor.