Download http://iphone.objectgraph.com/iseismometer/itunes/ Start iSeismometer, leave it on your desk, then try tap somewhere. You will realize how sensitive iPhone is! This is our new project to convert iPhone to seismometer. We created for fun and educational use, such as data collecting device. Please feel free to give us suggestion and feedback (iphone@objectgraph.com). [Instructions and Information] -iSeismometer stores 10 seconds of data. Visible area is last 3 seconds. This storage size will be increased in a future version. -If you suspend recording, you can drag the screen to re-track the previous data. -Submit data on the website with your location info. -You can also customize the target URL. See our website (http://iphone.objectgraph.com/iseismometer/) for more details. -Send the URL to your email address so that you can easily download the data as csv file. -Spectrum shows the Hz