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Old Faithful eruptions for TXT Some of the temperature data used to derive the eruption times and durations used in this section were collected by Ralph Taylor under a National Park Service research permit, and the remainder was collected by personnel working for the Geology Department of the Yellowstone Center for Resources including Ralph Taylor.
Analysis of the raw temperature data to extract the eruption data was performed by Ralph Taylor. The eruption time files on this website may be used provided that Yellowstone National Park Observation of one year old credited for the temperature data and Ralph Taylor is credited for the eruption times.
Activity Recorded by Data Logger - by Ralph Taylor Introduction Old Faithful Geyser has been monitored electronically using data loggers at least since the first year for which I have found data files.
There was an infrared system that recorded temperatures on a paper chart before that, but the data is not available in electronic form.
The data logger for Old Faithful measures the runoff water temperature at a point about 20 meters a rough estimate at best from the vent toward the west. The sensor picks up preplay and the eruption start, with a delay of between one and ten minutes from the visual times recorded in the OFVC logbook.
The mean delay for a period of several months in was found to be 3m46s with a standard deviation of 1m05s. The position of the sensor is far enough from the geyser that the eruption duration cannot be determined from the temperature trace. It has been known for many years that Old Faithful's eruptions can be predicted by timing the duration an eruption and using a regression formula to find the expected interval to the next eruption.
Since the data logger information does not contain duration information, it is not possible to find the regression data from the data set or to classify eruptions by duration.
In recent years Old Faithful has had increasing numbers of "long" eruptions more than about 3m30s duration and very few "short" eruptions. There are few eruptions of intermediate duration.
Since this behavior pattern became established, predictions have been made using one prediction interval for short duration eruptions and another for long duration eruptions with some special handling of the few intermediate duration eruptions.
For the purpose of the analysis presented here, I have only interval data, so I have classified eruptions as long or short based only on the interval.
Activity in The overall statistics for are shown at Old Faithful Statistics. This summary gives the statistics for all intervals, and separately for long and short intervals for the current year-to-date, the past month, and the past week.
The interval graph shows all of the intervals for The orange triangles mark instances of short intervals. The graph is updated about every six weeks.
Click for a larger image The next graph shows the intervals for the three months preceding the last data download at an expanded time scale. Again, the orange triangles denote short intervals, which often occur in clusters separated by days of exclusively long intervals.
In recent months Old Faithful is showing signs of returning to an old pattern of alternating long and short eruptions and therefore intervals. Click for a larger image This graph shows the activity for the month preceding the last download. The graphs all include a blue line showing all intervals, a green or yellow line showing the moving median interval.
The orange triangles at the 43 minute levels denote the short intervals. In the past few years short intervals have tended to occur in clusters separated by periods of days or even a week with no intervals less than 1h15m.
In the years that I have been analyzing Old Faithful, there have been no recorded instances of successive short intervals. Click for a larger image The interval distribution shows that the greatest number of intervals were between 1h30m and 1h35m, which contains about a third of the long intervals.
The category between 1h0m and 1h05m contains most of the short intervals.Nov 18, · I think what you see is very similar. From observation point you are higher and looking right at Angels landing.
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