Average Spectrum The amplitude spectrum averaged over all sensors for a day. The red curve is the average, the blue curves are night-time hours, and the green are daylight hours.
| The total volume of data recorded during the survey is approximately 160 Tbytes. The sampling rate on the original data is 500 sps. At Caltech we have about 5 weeks of the data that has been decimated to 250 sps. To the right, the spectrum of the data over a 24-hour period is shown. The red trace is the average spectrum, the green is work-time hours and the blue is evening and night hours. The roll off at the low frequency end is due to both the response of the geophone, and the 3Hz low-cut filter applied by the recorder. Useful energy is found as low as 1/10 Hz (10 seconds period). |
Average Spectrum The amplitude spectrum averaged over all sensors for a day. The red curve is the average, the blue curves are night-time hours, and the green are daylight hours. |
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| Comparison of the data recorded by one of the short-period sensors (red, top) used in the LB3D network and the Southern California Seismic Network (SCSN) broadband station (black) that is enbedded in the network. The event is the 2011/02/21 earthquake near Tonga (mb 6, depth 550 km). Both traces were filtered from 0.25-2.0 Hz. The time axis is in terms of samples, and the sample rate is 40 sps. |
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| Location map for two line. The profile for the blue line is shown to the right, while the green is shown below. | Profile in radial direction from the Carson earthquake (location shown in Eq movies section). Both the P and S waves can be seen. |
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| Blue line profile, which is almost tangential to the Carson earthquake source. | P-wave detail of the profile shown to the right. If the region were homogenous, the arives would be quasi-hyperbolic. |