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<div>The USGS Geomagnetism Program's Adjusted Data (aka "Provisional" by INTERMAGNET) provides near real time absolutely calibrated and geographically oriented geomagnetic observations. These calibration parameters are updated on the first of each month in
order to satisfy geomagnetic observatory standards for accuracy and quality control. Updates are deployed at midnight UTC, and may result in noticeable baseline shifts for observatories whose sensor response characteristics may have changed substantially since
the last such update, or in rare cases, whose actual sensor has been altered or replaced since the last update. To view the results of this month's update, go to:
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<div><a href="https://geomag.usgs.gov/plots/?timeRangeType=custom&endTime=2020-08-01T00:30:00.000Z&startTime=2020-07-31T23:30:00.000Z&type=adjusted">https://geomag.usgs.gov/plots/?timeRangeType=custom&endTime=2020-08-01T00:30:00.000Z&startTime=2020-07-31T23:30:00.000Z&type=adjusted</a></div>
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<div>There are several noteworthy issues to report in this notice, some related to COVID19-related travel and site-access restrictions, and one related to the recent Alaskan earthquake:</div>
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<li>Honolulu (HON) has been experiencing significant drift in its fluxgate sensor for several months, mostly the vertical (Z) axis. Adjusted processing was disabled for HON starting in July, and will continue to be disabled until USGS Geomagnetism Program personnel
can safely replace equipment.</li><li>Newport (NEW)'s total field (F) sensor has been unable to return good data since mid-July, which in turn impacts 3-axis fluxgate calibrations. There remains a small probability that this may be fixed via software, but otherwise NEW will remain offline until
personnel can safely replace equipment.<br>
</li><li>Stennis (BSL), which had been off-line due to unavailability of calibration measurements for several months due to COVID19-related restrictions, is now providing adjusted data as personnel can once again access the site to make calibration measurements.<br>
</li><li>Deadhorse (DED) is now offline because no calibration measurements have been made for approximately 4 months due to lack of industry partner support at the site due to COVID19-related changes in operations.<br>
</li><li>Shumagin (SHU) experienced a large (M7.8) earthquake on July 21st, and over a week powerful aftershocks. The shaking seems to have disrupted the sensor mechanically, causing uncalibrated offsets. Aftershocks seem to have stopped, so USGS Geomagnetism Program
personnel are preparing to re-align, and re-calibrate the sensor. SHU *may* come back online within the next week or so if there is no actual damage to the sensor.</li></ul>
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