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UNITED STATES DEPARTMENT OF INTERIOR U. S. GEOLOGICAL SURVEY Catalog of Earthquakes in the Yellowstone National Park -Hebgen Lake Region, Wyoming, Montana, and Idaho, for the Years 1973 to 1981 by A. M. Pitt 345 Middlefield Road Menlo Park, California, 94025 Open-File Report No. 87-611 This report is preliminary and has not been reviewed for conformity willi U.S. Geological editorial standards. Any use of trade names is for descriptive purposes only and does not imply endorsement by the USGS.

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Page 1: Catalog of Earthquakes in the Yellowstone National Park -Hebgen … · 2010-11-04 · Catalog of Earthquakes in the Yellowstone National Park -Hebgen Lake ... 1984, Crustal structure

UNITED STATES DEPARTMENT OF INTERIOR U. S. GEOLOGICAL SURVEY

Catalog of Earthquakes in theYellowstone National Park -Hebgen Lake Region,

Wyoming, Montana, and Idaho,for the Years 1973 to 1981

byA. M. Pitt

345 Middlefield Road Menlo Park, California, 94025

Open-File Report No. 87-611

This report is preliminary and has not been reviewed forconformity willi U.S. Geological editorial standards.

Any use of trade names is for descriptive purposes onlyand does not imply endorsement by the USGS.

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NETWORK fflSTORYIn 1963, the U.S. Geological Survey (USGS), at the request of personnel from Yellowstone

National Park (YNP), began to operate seismograph stations in the Yellowstone-Hebgen Lake region. The operating conditions were difficult for the instrumentation available at that time. Each station had to operate independently, requiring a dark room for photographic recording, chronometer, radio-time code receiver, and 110 volt power with battery backup for periods of power failure. Stations in the inte­ rior of YNP had to operate up to 30 days without servicing during the winter. By late 1964, five sta­ tions were monitoring earthquake activity in YNP and the Hebgen Lake area to the West Records were changed by YNP personnel within the Park and by U.S. Forest Service personnel west of the Park. This network monitored the level of seismic activity in the Yellowstone-Hebgen Lake region till 1972 but instrument problems limited the number of events recorded on three or more stations for epicenter determination to about 550 earthquakes. Earthquakes in the Yellowstone region with magnitudes (M) greater than 3.5 were often recorded by other seismograph stations in the western United States. These data were reported to the International Seismological Center (ISC). The ISC data have been combined with the locally recorded data to produce a data set of 775 Yellowstone region earthquakes that is nearly complete for M 4 and larger events from 1964 to 1972. A catalog of these events has not been published but they are included on a map of seismicity from 1964 to 1981 (Pitt, in press) and on a figure in Eaton and others (1975).

In November 1972, the network was modernized with the installation of battery-powered stations from which the data were telemetered by radio and telephone lines to Mammoth Hot Springs, YNP, where they were recorded on a common time base. Visual drum recorders (Geotech Helicorders) were installed at the Old Faithful and Mammoth Hot Springs visitor centers for public information and to provide backup for the primary recorder. After 1979, the data were telmetered to the USGS in Menlo Park, California. In November 1981 the network was reduced to the two Helicorders located in YNP. In November 1983, the network was reactivated with the data being telemetered to the University of Utah (UU) at Salt Lake City, Utah, for analysis. The 1973 network consisted of eight stations in YNP and four stations in the Hebgen Lake area. All had one Hz vertical seismometers. Four of the stations were placed near thermal areas to look for any association between seismic activity and changes in thermal features. The remaining stations were positioned to study the tectonic processes active in the region. The data were recorded on 16 mm microfilm on a Geotech Develocorder. In October 1974, the network was enlarged, both by increasing the density of stations within YNP and by extending the network beyond the park to more clearly define the region of teleseismic P-delays associated with the Yellow- stone caldera (Eaton and others, 1975). The network consisted of 26 stations, eight of which also had a horizontal seismometer oriented north-south in addition to the vertical seismometer. All data were recorded on magnetic tape and 17 stations were recorded on film. The seismograph system is described in detail in Eaton (1977) and Lee and Stewart (1981). The network was reduced by nine stations in 1976, increased by four stations in 1978, and reduced to 16 vertical seismometers in 1980. Eleven of the sites were occupied for the entire nine year period. The long-term network was periodically aug­ mented with temporary stations for aftershock studies, teleseismic P-wave studies, and refraction exper- ments. Supplemental data were also included from temporary UU stations and from long-term stations operated by the University of Montana, Montana Bureau of Mines and Geology, Idaho National Engineering Laboratory (INEL), and Ricks College, Rexburg, Idaho. The supplemental data were used extensively from 1978 onward. Unfortunately the INEL and Ricks College records for 1976 and 1977 were lost before they could be used to supplement the Yellowstone network. Seismograph stations are shown on figure 1 and earthquake epicenters on figure 2. The Bibliography lists publications using the local earthquake data from the USGS network.

DATA COMPLETENESS

During the nine years of recording, the completeness of the data analysis was nonuniform due to instrument problems and to processing difficulties. Data loss from instrument malfunctions was greatest in 1973 and 1974 and least in 1980 and 1981 when recorded in Menlo Park. The minimum magnitude cutoff for processing varied, especially during intense swarm activity. The efficiency of data processing improved over the years and almost all 1976-1981 non-swarm events greater than M2 were located and the magnitude limit was pushed as close to M2 as possible during swarms. Figure 3 shows frequency magnitude plots for the three 3-year intervals corresponding to figure 2. The years 1979-1981 appear to

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be complete to below M2, 1973-1975 to M2.1, and 1976-1978 to M2.5. Untimed events larger than M2 in several large swarms during 1976-1978 may distort the completeness level of the background seismi- city during those years. The ISC catalog lists 37 Yellowstone region events not included in this catalog. Twenty-six events occurred in 1973 and 1974, nine in 1975. The 1973-1975 catalog (Pitt, 1980) lists the ISC locations for these events. Most events occurred during periods of instrument malfunction.

LOCATION PROCEEDUREHypocenters were calculated with the program HYPO71 (Lee and Lahr, 1975) using a one dimen­

sional velocity model and associated station traveltime corrections determined by E. Kistling (written communication, 1985) of the Swiss Federal Institute, Zurich, Switzerland from inversion of a subset of well recorded earthquakes. The model and station corrections are shown on figure 4. In HYPO71, focal depths are referenced to a datum based on the average elevation of the stations. Lateral and vertical variations from the uniform velocity model are reflected in the station traveltime corrections. The pat­ tern of station corrections is in general agreement with the regional geology. Some stations are located within the caldera boundaries of the three Yellowstone volcanic eruptions (2.0, 1.3, and 0.6 million years ago) and some in older geologic regions to the north and east (fig. 1). The corrections for stations located on the caldera fill material are generally more positive than those for stations on more com­ petent material. For events within the network, only P-arrivals were used unless they were inadequate to constrain the earthquake location. S-arrivals were used, where necessary, to locate events outside of the network. This generally included most events with a maximum azimuthal gap between stations greater than 220 degrees. The Vp/Vs value of 1.70 was determined from a selected data set with high quality S-arrivals (Chatterjee and others, 1985). In general, arrivals from stations beyond 125 km were not used but for some events this distance limit was extended.

Earthquake hypocenters are most accurate in the parts of the network well covered by seismo­ graph stations and where the velocity model is most realistic. Figure 5 shows the HYPO71 locations for five refraction explosions in the region (fig. 4) relative to their actual locations. Three epicenters are within 1 km of their true position but have up to 7 km errors in focal depth. The other two explosions are mislocated by about 5 km, but they are on the edge of the network and the locations would prob­ ably be constrained by S-arrivals had they been earthquakes.

Magnitudes were generally determined from the coda duration on the Develocorder film. If this was not possible, signal durations from the Helicorders or from non-USGS stations were used. In a few cases of closely spaced large events, the ISC amplitude magnitude for the event was used. Coda dura­ tion Magnitudes were calculated using the following equation (Lee and Lahr, 1975):

M = -0.87 + 2.0(log of duration in sec) + 0.0035(epicentral distance in km)

This relationship was derived for earthquakes in northern California. M. C. Stickney (written communi­ cation, 1981) compared HYPO71 coda duration magnitudes of selected events with amplitude magni­ tudes for the same events determined on the World Wide Standard Station MSO at Missoula, Montana (figure 6) and found that the HYPO71 formula gives reasonable magnitude values for Yellowstone. Events used in figure 6 are indicated in the catalog.

ACKNOWLEDGEMENTSData from supplemental stations were provided by Adrian Dahl and John King of INEL, Ed Wil­

liams of Ricks college, Dr. Anthony Quamar of the University of Montana, Michael Stickney of the Montana Bureau of Mines, Dr Bob Smith and other personnel of the University of Utah, and Waverly Person and John Minch of the National Earthquake Information Service.

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BIBLIOGRAPHY

Chatterjee, S. N., Pitt, A. M., and lyer, H. M., 1985, Vp/Vs ratios in the Yellowstone National Park region, Wyoming. Jour. Vol. and Geoth. Res., 26, 213-230.

Eaton, G. P., Christiansen R. L., lyer, H. M., Pitt, A. M., Mabey, D. R., Blank, H. R. Jr., Zietz, I., and Gettings, M. E., 1975, Magma beneath Yellowstone National Park. Science, 188, 787-796.

Eaton, J. P., 1977, Frequency response of the USGS short period telemetered seismic system and its sui­ tability for network studies of local earthquakes. U.S. Geol. Surv. Open-File Report, 77-844, U.S. Geol. Surv., Wash. D.C., 45p.

Foumier R. O., and Pitt, A. M., 1985, The Yellowstone magmatic hydrothermal system, U.S.A. 1985, International Symposium on Geothermal Energy, International Vol., Geothermal Resources Council, Cal Central Press, Sacramento, C.A., 319-327.

Lee, W. H. K. and Lahr, J. C., 1975, HYPO71 (revised): A computer program for determining hypo- center, magnitude, and first motion pattern of local earthquakes. U. S. Geol. Surv. Open-File Report 75-311, 113p.

Lee, W. H. K. and Stewart, S. W., 1981, Principles and applications of micro-earthquake networks. Academic Press Inc., New York, NY.

Pitt, A. M., 1979, Preliminary map of earthquake epicenters in Yellowstone Park and vicinity 1973- 1978. U.S. Geol. Surv. Open-File Report, 79-717, U.S. Geol. Surv., Wash. D.C., scale 1:250000.

Pitt, A. M., 1980, Catalog of earthquakes in the Yellowstone Park-Hebgen Lake region from November 1972 to December 1975. U.S. Geol. Surv. Open-File Report, 80-2006, U.S. Geol. Surv., Wash. D.C., 31p.

Pitt, A. M., (in press), Maps showing earthquake epicenters (1964-81) in Yellowstone Park and vicinity, Wyoming, Idaho, and Montana. U.S. Geol. Surv., Miscelaneous Field Studies Map, MF-2022, U.S. Geol. Surv., Wash. D.C., scale 1:250000.

Pitt, A. M., and Hutchinson R. A., 1982, Hydrothermal changes related to earthquake activity at Mud Volcano, Yellowstone National Park, Wyoming. Jour. Geoph. Res., 87, B4, 2762-2766.

Pitt, A. M., Weaver, C. S., and Spence, W., 1979, The Yellowstone Park earthquake of June 30, 1975. Bull. Seis. Soc. Am., 69, 187-205.

Smith, R. B., and Braile, L. W., 1984, Crustal structure and evolution of an explosive silicic volcanic system at Yellowstone National Park, in Studies in Geophysics; Explosive Volcanism: Inception, Evolution, and Hazards, in National Academy Press, 96-111.

Smith, R. B., and Christiansen, R. L., 1980, Yellowstone Park as a window on the earths interior. Scientific American, v 292, n 2, 104-117.

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45°-

44°

113° 112° 111° 110°

Fig. 1. Seismograph stations in the Yellowstone Park region. USGS long term stations are marked by triangles (larger for stations operating over 3 years). Circles mark USGS temporary stations, squares mark non USGS long term stations. Dotted lines are the caldera boundaries for the Yellowstone volcanic eruptions 2.0 (I) and 0.6 (III) million years ago.

Fig. 2a. Earthquake epicenters 1973-1975. Triangles mark seismograph stations (not all in operation at the same time). Calderas and Yellowstone Lake same as Figure 1, light solid and dotted lines are faults showing evidence of Quaternary movement (R. L. Christiansen, written communication, 1980).

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- ivM'f"-^ r *-}"Ip^Fig. 2b. Earthquake epicenters 1976-1978. Rest same as Figure 2a.

Fig. 2c. Earthquake epicenters 1979-1981. Rest same as Figure 2a.

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B= 0.89 +/-0.04 USING 627. EVENTS

1973-1975, 1124 events

1976-1978, 3393 events

1979-1981, 1835 events

B= 1.21 +/-0.05 USING 599. EVENTS

B= 0.98 +/-0.04 USING 777. EVENTS

1 23456MAGNITUDE

Fig. 3. Frequency magnitude (M) plots for the earthquakes shown in Figure 2. The lower points show the number of earthquakes per 0.1 M interval. The upper points are the cumulative number >_ M. A line with slope "b" is fitted to the larger magnitude earthquakes to test for com­ pleteness to a minimum magnitude marked by an arrow.

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1D-MODEL YELLOWSTONE AREA

SURFACE 0 YELLOWSTONE

CALDERA

10

i 20

P-VELOCITY (KM/SEC) 468

30

40

1

Fig. 4. Velocity model and map of travel-time corrections at long term seismograph sta­ tions. Negative corrections (early) are in squares, positive corrections Gate) in circles. The solid circle was selected as the zero reference station. Caldera and park boundaries are the same as in Figure 1; stars mark the locations of refraction explosions used in Figure 5.

oz 780922 1000 45-00.24 110-01.63

+0.52 sec, Z 7, D 3, G 268

780922 1230 44-56.43 110-44.30 0.00 sec, Z 3, D 6, G 120 '

780917 1100 44-17.11 111-20.20 -0.40 sec, Z 1, D 15, G 125

770909 0615 44-45.48 111-05.86 -0.25 sec, Z 3, D 4, G 63

780921 1130 44-05.37 110-41.03 +0.07 sec, Z 8, D 37, G 200

0I

5 km

Fig. 5. The locations of 5 explosions (stars in Figure 4) are superimposed at the square. Circles indicate the relative HYPO71 locations for the events. The actual coordinates are given along with the origin time difference (actual minus HYPO71 computed) and the HYPO71 focal depth (Z) in km, distance to nearest station (D) in km, and maximum azimuthal gap between sta­ tions (G).

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4-

w 3 HO CO

M(USGS) = 0.88M<MSO)+0.32

234

M(MSO)

Fig. 6. Comparison of USGS duration-time magnitudes with Missoula, Montana Wood- Anderson-equivalent amplitude magnitudes for earthquakes in the Yellowstone Park region. Larger symbols indicate 2 or 3 events with the same value.

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APPENDIX: CATALOG OF YELLOWSTONE-HEBGEN LAKE EARTHQUAKES 1973-1981

The following data are given for each event:

1. Origin time in Coordinated Universal time (UTQ: DATE, hour (HR), minute (MN), and second (SEC).

2. Epicenter in degrees and minutes of north latitude (LAT N) and west longitude (LONG W).

3. DEPTH, depth of focus in kilometers.

4. MAG, local magnitude of the earthquake determined from the coda duration of the earthquake. A "*" before the number indicates an event that also has a magnitude value determined from the sig­ nal amplitude at the World Wide Standard Station at Missoula, Montana (see text).

5. NO, number of P- and S-arrivals used in locating the earthquake. If S-arrivals are used in the loca­ tion, the number is followed by the letter "s".

6. GAP, largest azimuthal separation in degrees between stations.

7. DMIN, epicentral distance in kilometers to the nearest station. If observations from stations beyond 125 kilometers are used in the solution, DMIN is proceeded by the letter "x".

8. RMS, root-mean-square error of of the time residuals:

RMS =y £ R 2 /NO

where Ri is the observed seismic-wave arrival time minus the computed time at the ith station.

9. ERH, standard error of the epicenter in kilometers:

vERH = i/ SDX2 + SDY 2

where SDX and SDY are the standard errors in latitude and longitude, respectively, of the epi­ center.

10. ERZ, standard error of the depth in kilometers.

11. Q, solution quality of the hypocenter. This measure is intended to indicate the general reliability of the earthquake location. Q is based on both the nature of the station distribution with respect to the earthquake and the statistical measure of the solution. These two factors are each rated independently according to the following schemes:

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Statistical Measures

RMS (sec) ERH (km) ERZ (km)

A <0.15 . <1.0 <2.0B <0.30 <2.5 <5.0C <0.50 <5.0D Others

Station Distribution

NO GAP DMIN

A >6 -^90 < DEPTH or 5 kmB >6 <135 <2 x DEPTH or 10 kmC >6 <180 <50kmD Others

12. Summary quality rating. This value is determined by averaging the Statistical and Distribution rat­ ings (i.e., an A and a C yield a B, and two B's yield a B). When the two ratings are only one level apart, the lower one is used (i.e., an A and a B yield a B). The double and single quality values are separated by a I to facilitate editing subsets of events.

13. M, the method of recording the data. This has some influence on the quality of the location. "T" indicates an event with a playback from magnetic tape. These events will generally have the most complete and reliable readings. "C" indicates an event recorded only on film (No horizontal and only a subset of the vertical seismometers were recorded on film). "H" indicates an event missed on both film and magnetic tape. These events were located using only the Helicorder monitors and/or data from temporary stations or non-USGS permenant stations outside of the network.

The accuracy of the hypocenter solution relative to the true location of an earthquake is depen­ dent on the distribution of the seismograph stations relative to the earthquake, the accuracy of the timed arrivals at the various stations, and the degree to which the velocity model used in the calculations matches the actual velocity structure beneath the network. In using this catalog, the quality values can generally be used to evaluate the inaccuracy of the earthquake epicenters in the following way: AA and AB 1 km; AC, BB, and BC 2-3 km; others 5 or more km. The accuracy of the focal depth determina­ tion is more uncertain. As a general rule, at least one seismograph station must have an epicentral dis­ tance <_ the focal depth to determine a reliable depth. This condition is progressively more difficult to achieve for shallow seismicity such as the earthquakes within the Yellowstone caldera. The ERZ values in the catalog are often excessively optimistic when compared to the DMIN.

The earthquake hypocenter data contained in the Apendix (years 1973 to 1981) along with the unpublished hypocenter data for earthquakes occurring from 1964 to 1972 may be obtained on magnetic tape for computer input by contacting:

National Oceanic and Atmospheric AdministrationNational Environmental Satellite, Data, and Information Service

National Geophysical Data Center325 Broadway

Boulder, Colorado 80303

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