The TC1 is a simple vertical seismometer. Its natural period is less than one second. This version, VIII, reflects the latest set of modifications since the first version in 2005. It is very “Kid” friendly and uses a “Toy Slinky Spring”, magnets, and a coil. The entire seismic system is composed of the sensor, an amplifier called the NERdaq, a pc computer, and software.
It may be a surprise to those unfamiliar with the TC1 that this sensor does a remarkable job of seeing and recording earthquakes, small and large, from near and far. It records earthquakes from all over the world. Most home-built seismic sensors target recording events greater than 7M worldwide. This systems does much better, recording greater than 6M in most cases worldwide, and local events greater than 2M. On the other hand, it is simple, cheap, and easy to understand and maintain. The plans are posted here for free, but if you want to buy a kit, please use the paypal button: The “Buy Now” button works great, but due to demand please email me first firstname.lastname@example.org to check inventory. Also this Buy Now button and the price is only good for lower 48 US states, not Hawaii, Alaska, or international. Email me for those shipping cost.