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PACP - Pacheco Peak, CA, USA
- Location:
-
PACP is installed at Pacheco Peak in south
Santa Clara County. The site was established
under the auspices of the
CA Department of
Forestry and Fire Protection and
Santa Clara County. The
mountain top site has two existing concrete radio
vaults and 30 meter antenna towers. Police, fire,
and state, and county communication equipment are
housed there.
Support for PACP was provided by
the Governor's Office of Emergency Services
as part of the California Integrated Seismic Network.
- Geology:
-
Miocene Volcanic Andesite
- Vault/Borehole conditions:
-
The PACP vault is a surface installation, constructed
on bedrock outcrops on Pacheco Peak. The pier is
surrounded by concrete bricks and 4" of insulation.
The entire vault is then surrounded and topped by bags of
concrete mix.
- Instrumentation:
-
| Sensor | Datalogger | Start Date | End Date | SEED Channels | Location |
| Battery Voltage | Q4120 | 2003/06/19 | Present | LE?,UE? | |
| Internal Temperature | Q4120 | 2003/06/19 | Present | UK? | |
| Kinemetrics FBA ES-T Accel. (2 g max 10 v/g) | Q4120 | 2003/06/19 | Present | BL?,LL?,HL? | |
| Motorola MPX201 Pressure | Q4120 | 2003/06/19 | Present | LD? | |
| Streckeisen STS-2 VBB Tri-Axial Seismometer | Q4120 | 2003/06/19 | Present | BH?,HH?,VH?,UH?,UM?,LH? | |
| YSI 44031 Thermistor | Q4120 | 2003/06/19 | Present | LK? | |
- Network:
-
BK (Berkeley Digital Seismic Network)
- Operation Notes: (may not be current)
- This section summarizes major changes in equipment or in instrumentation at PACP.
- 2004/06/15: Changed BH channels from 20 Hz to 40 Hz sampling rate.
- 2003/09/11: Seismometers relocated to new pier.
- 2003/07/01: Changed HH channels to have causal filters.
- 2003/06/19: Equipment installed temporarily in the
Santa Clara County communications facility while the
vault is prepared.
- Noise Characteristics:
-
The figures below are cumulative plots of power spectral density (psd)
determined from the broadband channels. In each figure, the vertical
component psd is plotted with blue diamonds, the north component
psd with red squares, and the east component psd with green circles.
The results are presented in the 5 different frequency bands, and
the USGS/Albuquerque low noise model is plotted as a dashed line in each.
The PSD units are in dB (decibel) relative to 1 (m/s**2)**2/Hz. The current
annual plot is updated weekly.
| Cumulative PSD results |
| 1999 |
2000 |
2001 |
2002 |
2003 |
2004 |
2005 |
 |
 |
 |
 |
 |
 |
 |
- Data Availability:
- BDSN waveforms and associated metadata are available at the
Northern California Earthquake Data Center (NCEDC).
Several tools provide access to SEED format data at the
NCEDC, both in terms of querying the archives and
allowing data requests.
- Querying the archives
- Requesting data
Help on using these
tools is available.
Copyright 1995-2005, The Regents of the University of California.
Last modified: Wed Jun 25 13:34:08 PDT 2008
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