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Transactions VII


Old Faithful Geyser’s Lengthening Intervals

Lynn Stephens

Abstract: As of December 31, 2001, Old Faithful’s average interval has lengthened by 15 minutes, or almost 20%, since 1988. This report reviews the record of Old Faithful’s average interval through the 1988 edition of The Story of Old Faithful (which included data through 1987), updates the record to contain additional summary statistics through 2001, and discusses some of the changes in Old Faithful’s intervals that have occurred in recent years.


The Geyser Hill Wave in May 2002

T. Scott Bryan

Abstract: A cursory examination of eruption data for Beehive Geyser and Little Squirt Geyser indicates that the “Geyser Hill Wave” was operating in May 2002 much as it did in Summer 1992.


The Twentieth Century History of Giant Geyser, Upper Geyser Basin, Yellowstone National Park

Mike Keller

Abstract: Research in the archives of Yellowstone National Park revealed numerous eruptions of Giant Geyser previously unknown to modern observers. In this paper, this activity is discussed on a yearly basis. The newly discovered eruptions change our perception of the pattern of Giant’s activity during the 1900’s. George Marler believed Giant to erupt on a “five year cycle” of activity. This does not appear to be the case. Also, there seem to have been fundamental changes in Giant’s behavior three times this century (pre–1900 to 1947, 1949 to 1955, and 1978 to present.


Historic Geyser Activity in the Purple Pools Complex

Mike Keller, with T. Scott Bryan

Abstract: Eruptive activity by any of the Purple Pools is rare, having been seen only in 1987, 1998 and 2000. South Purple Pool was active on each of those occasions. In 1987 and 1998, it was accompanied by East and North Purple Pools as they underwent their only known eruptions. In 1998 and 2000, South Purple was also joined by UNNG–GNT–1. This historic action is summarized in this paper.


Fan and Mortar Geysers in the Summer of 2001, May 24 to November 4

Tara Cross

Abstract: During 2001, Fan and Mortar Geysers erupted with relative frequency. Observations of the cyclical activity between major eruptions revealed consistent patterns of behavior. This article details the patterns that were observed in 2001 and discusses how this activity differed from that seen in previous years.


Slide Geyser, Upper Geyser Basin, 1974—2001

Lynn Stephens

Abstract: This paper summarizes Slide Geyser’s activity from the inception of its known activity in 1974 through 2001. In general, during this history the geyser has shown gradually increasing intervals and slightly decreasing durations.


Geyser Activity North of East Mustard Spring in Biscuit Basin, June–July, 2001

Steve Gryc

Abstract: Five small hot springs located to the north of East Mustard Spring in Biscuit Basin were active as periodic geysers during June and July of 2001. This report describes the activity of the five springs and gives data related to their eruption times, durations and intervals.


Geyser Activity North of East Mustard Spring in Biscuit Basin, May and August, 2002

Nancy Bower

Abstract: Observations on small geysers in the northern portion of Biscuit Basin were conducted in 2002, prior to realizing that Steve Gryc had made similar observations during mid–summer 2001. A comparison of the two data sets indicates some significant changes in eruptive behavior.


Fountain Geyser: Electronic Monitor Results from 2000 and 2001

Ralph Taylor

Abstract: An electronic temperature recorder, or data logger, was deployed on Fountain Geyser beginning in August 2000. This paper discusses the data collection methods and analyzes trends in Fountain Geyser’s eruptive behavior as deduced from the temperature record from August 2000 to December 2001. A significant shift in eruption frequency and duration occurred following a period of “wild phase” activity in November 2000.


Norris Geyser Basin in 1974 — A Summary of Geyser and Disturbance Activity

T. Scott Bryan

Abstract: The summer season of 1974 was among the most remarkable ever experienced at the Norris Geyser Basin. Most features with any record of previous activity played that year, often with great frequency, and a few features never previously known as geysers also underwent eruptive activity. Many details about this action were recorded by the naturalist staff in the handwritten logbook that was maintained at the Norris Museum. In fact, so intense was the geyser activity that many things that would be taken as extremely remarkable in later years were not recorded in 1974, because then it was ordinary. It is highly unfortunate that the Norris logbook of 1974 was misplaced for more than two decades before being located and made available during 1998. Here, then, is information about a special year that, until now, has gone largely unrecognized.


“Resurgent Geyser”, Potts Hot Spring Basin, 1997–2001

Ralph C. Taylor and James B. Grigg

Abstract: The authors have been studying the Potts Hot Spring Basin under the auspices of the National Park Service, initially in Resource Management and in the past three years with the Yellowstone Center for Resources. During this study, one medium–sized geyser, informally named “Resurgent Geyser,” has been active each year. The initial vandalized condition, the repair of the damage, and the activity of Resurgent Geyser for the years 1997–2001 are discussed in this paper.


Iceland’s Geysir Aroused by Earthquakes in June 2000

Gudmundur Pálmason

Abstract: Geysir, the namesake of all geysers, reactivated following two earthquakes in June 2000. Geysir’s history and the rejuvenation are described in this paper, as is the action by its neighbor, Strokkur.


The Geysers of New Zealand — Part 1: The Rotorua Geothermal System

A.D. Cody, R.F. Keam and K.M. Luketina

Abstract: The Rotorua geothermal field contains the largest, most spectacular and most consistently active geysers in New Zealand. The historic and current activities of these geysers are described in this paper.


Summary of New Zealand Geysers — Waikato Region outside of Rotorua

Katherine Luketina and Ashley D. Cody

Abstract: This paper provides a summary of geyser activity in each New Zealand thermal area, other than the Rotorua Geothermal System. Observational data is current to recent years and often into 2002.


Crypto–geysers of Waimangu, New Zealand

Dr. R.F. Keam

Abstract: Three thermal features in the Waimangu area, New Zealand, exhibit geyser–like intermittent activity without ejecting elevated water columns above their vents. This paper describes and defines these features as “crypto–geysers” and asks if similar features are known elsewhere (such as Yellowstone).


Size Comparisons of the World’s Major Geyser Fields

T. Scott Bryan

Abstract: The important geyser fields of the world are remarkably small in areal extent. As illustration of this, these pages simply present a series of comparative maps.



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