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Ore Bin / Oregon Geology Magazine / Journal ~ ~ OREGON GEOLOGY Oregon Department of Geology and Mineral Industries Volume 61, Number 5, September/October 1999 IN THIS ISSUE: 1997 Vida, Oregon, eart hquake swarm Miocene Metasequoia Creek flora Site-specific seismic reports- part 2 Silicic volcanism in the Cascade Range • How many earth- quakes occur in Oregon over a year, and where? Abstracts of theses THROUGH THE EYES OF THE STATE GEOLOGIST After discovering parts of the West, John Wesley Powell proposed in the late 1800$ that governmental entities be structured around watersheds. But with rail lines, various Homestead Acts, M ining Districts. post-Civil War politics, and the ru sh to make a liv­ ing off the land, settlers soon developed other patterns- more attuned to " progress" than to ecosystems. Today, however, ecosystems, including watersheds , have become keys for OUf survival. Effectively working with ecosystems requires that diverse sciences and interests de ­ velop new ways of working together to solve regional problems. While each organiza­ tion is used to approaching issues according to its own mandate. history. and re ­ sources, we had better find ways to integrate those approaches into comprehensive goals. This calls for non regulatory as well as regulatory efforts. And while today the emphasis is on individual endangered species, primarily fish, future years may see a balancing towards broader concerns as well. In the Department of Geology and Mineral Industries (DOGAMI), many of our cur­ rent successes with ecosystem health are in the Mined Land Reclamation (MLR) Program, located in our Albany field office. Many disciplines come together there to provide for additional beneficial uses of mined land. MLR staff work with government agencies , the private sector, and environmental groups on projects that affect ecosystems, such as sediment management at mine sites, creation of a " Best Management Pract ices " manual with our neighboring states of Idaho and Washington, and participation in river initiatives and other stream channel morphology efforts . More new efforts are emerging in the agency, as we focus on sustainabHity for both economic progress and ecosystem health. We are, for example, beginning to focus our mapping efforts to produce detailed geologic map ­ ping in key areas of groundwater concern. In the future, we also hope to make appropriate enhancements to geo­ logic maps, so that they better meet the needs of ecosystem and watershed managers. By itself, this agency certainly is not going to solve boundary problems as they relate to governance of water­ sheds . And DOGAMI alone can not produce answers where current government structures are trying to relate to ecosystem structures. However, DOGAMI can help with focused efforts on the ground to put good information in the hands of watershed and ecosystem managers when they need it. The Nature of the Northwest Information Center: Suite 177, 800 OREGON GEOLOGY NE Oregon St. # 5. Portland, OR 97232·2162. phone (503) 872- 2750, FAX (503) 731-4066 Inlernet http://www.naturenw.org VOLUME 61, NUMBER 5 SEPT.IOCT. 1999 Donald J. Haines. Manager. Publo.!Ied bomonlhly., 1ar1 .... 'Y. M.l<do. May. July. ~~ N"....mb.. b)- the a.epl~ · Periodicals postage paid at Portland, Oregon. Subscription rates : 1 .......,t o! GtoIoJy ,00 MIoo<.Illoduitn.s (VoIu ..... , Ih<oug. 40 weI • ..,,\Itled The Ore 8m.) year, $10; 3 years, $22. Single issues, 53 . Governing Board Address subscription orders, renewals, and changes of address to Ore­ gon Geology, Sui te 965, 800 Nf Oregon Stree t # 2B, Portland 97232. Donald W. Christensen, Chair ..................... Depoe Bay Arleen N. Barnett . Portland POSTMASTER: Send address changes to Oregon Ge­ Vera Simonton . .. .. Pendleton ology, Suite 965, 800 NE Oregon St. # 28, P"o rtland, State Geologist ........... John D. Beau lieu OR 97232-2162. Acting Deputy State Geologist . Dennis L Olmstead Editor .•. ...•..••..•...•..• Klaus K.E . Neuendorf Production Assistants ...... __ •... Kate Hals tead. James Roddey Cover photo Eagle Creek Formation outcrop at Tanner Creek in Main Office: Suite %5, 800 NE Oregon Street # 28, Portland 97232, phone (503) 731-4100, FAX (503) 731-4066. Multnomah County, near the Columbia River and Internet: http://salVis.dogami.state.or.us Bonneville Dam . In the upper half of the picture, Baker City Field Office: 1831 First Street , Baker City 97B14, phone three upright petrified trees can be seen , which are, (541 ) 523-3133, FAX (541) 523 -5992. in this formation , typically accompanied by orange­ Mark l. Ferns, Regional Geologist. colored staining below. Article beginning on page Grant s Pass Field Office: 5375 Monument Drive, Grants Pass 97526. 111 by William Krause reports on a fossil location in phone (541) 476-2496, FAX (541) 474-3158. what appears to be a low section of the Eagle Creek Th omas J. Wiley, Regional Geologist. Formation, on the south shore of th e Columbia River Mined l and Reclamation Program: 1536 Queen Ave. SE, Albany and about 2 mi west of Bonneville Dam , Photo by 97321. phone (541) 967-2039, FAX (5 41) 967-2075. I nlerne!: http://www.proaxis.com/- dogami/ mlrweb.shlml Rachel A. Carlin (see re ference list at end of Krause 's Gary W. lynch, Su pervisor. article). 106 OREGON GEOLOGY, VOLUME 61, NUMBER 5, SEPTEMBER/OCTOBER 1999 The 1997 Vida, Oregon earthquake swarm by Sue Perry and Ray Weldon 1/, University of Oregon, Eugene, Oregon ABSTRACT Three small earthquakes (magni­ tudes 2.1-2.6) occurred near Vida, Oregon, in May, 1997. We have re­ determined their locations with a one-dimensional velocity model and constructed focal mechanisms and a net moment tensor. Earthquake loca­ tions, focal mechanisms. and mo­ ment tensor aU indicate that the pre­ ferred slip plane is steeply dipping and trends north-northwest. The net sense of motion is right lateral with a reverse component. similar to that of the Scotts MiHs earthquake (1993, magnitude 5.7), which had a more pronounced reverse compo­ nent. The Vida focal mechanisms and moment tensor are consistent with regional maximum horizontal stress that is essentially north-south, as has been documented by several other workers, Figure 1. Map of Oregon showing locations of principal rivers, Cascade volca­ noes (triangles), towns (dots), and 1997 Vi da earthquake swarm (boxed circle). INTRODUCTION Inset: Epicenters of the five largest earthquakes, with event numbers keyed to In May 1997, five small earth­ Tabl e 1 and depths (km) in parentheses. Tr iangles represent epicenters newly re­ quakes (magnitudes 1.5-2,6) oc­ determined for this study. Other data are from catalog of Pacific Northwest Seis­ curred in the western Cascades. The mic Network (PNSN). Pacific Northwest Seismic Network (PNSN) located them near Vida, Iy twelve days of continuous opera­ above (R. Ludwin, PNSN geophysi­ Oregon, about 45 km (28 mil east tion, DHN recorded as many as 80 cist. written communication, 1998). of Eugene (Figure 1, Table I). Al ­ earthquakes per day. Only five were The level of small-magnitude, back­ though small , the earthquakes were large enough to be located by the ground seismicity is well known only felt locally. Further, ground shaking PNSN and thus preserved in the net­ near Portland, where instrumenta­ triggered a landslide on a steep, work catalog. tion is densest. logged slope that had become un­ To adequately determine an earth­ The Vida swarm is not the only stable during the previous winter's quake epicenter (the point on the recent swarm near Eugene. In June rains (Mortenson, 1997). Earth's surface that is directly above 1998, PNSN located magnitude 2 5taff at the Department of Geo­ the earthquake's origin), it takes earthquakes northwest and south­ logical Sciences, University of Ore­ three seismometers surrounding the east of Eugene. Our staff was test­ gon (UO), deployed three available event. To determine the event's ing seismometers in Eugene and Sprengnether 5-6000 seismometers, depth, at least four seismometers are recorded two distinctive groups of and got usable results from one (site required. Earthquakes of small mag­ waveforms that suggest swarms in DHN, Figure 2). Analyzing these, we nitudes do not radiate enough ener­ different locales. Additionally, in discovered that the five earthquakes gy to be clearly located by distant early 1996, while we deployed seis­ were the biggest in a vigorous swarm. seismometer stations. PNSN collects mometers in Eugene and Springfield That is, the Vida earthquakes oc­ data from fewer than 40 seismome­ to assess seismic hazard, we record­ curred quite close to one another in ters in Oregon (Figure 2). In north­ ed a series of small earthquakes with time and space and had magnitudes ern and western Oregon, they pro­ virtually identical waveforms. These similar enough that no event was vide a complete record of earth­ events appeared to be part of a clearly the main shock. During near- quakes of magnitudes 2.5 and swarm located about 15 km (10 mil OREGON GEOLOGY, VOLUME 61 , NUMBER 5, SEPTEMBER/OCTOBER 1999 .07 Tabl e I. Source parameters of the five largest 1997 Vida earthquakes, deter- mine which nodal plane represents mined by the Pacific Northwest Sei smic Network (PNSN) the fault plane. Summed moment Eve nl no. Dale Time (UTe) lal N. long W. Depth (km) Magnitude tensors use nodal planes and earth­ quake sizes to calculate net defor­ EV 1 5/22/97 10:35 44.066 122517 6.8 2.3 mation (strain) and can be repre­ EV 2 5/ 22 /97 13:57 44.066 122520 8.1 2.6 sented as focal mechanisms. Focal EV 3 5/ 22(97 14:07 44.061 122.529 4.2 1.8 EV 4 5/ 22(97 17:17 44.072 122 .525 81 1.5 mechanisms and moment tensors both allow inferences about regional EV 5 5/ 24/ 97 09:00 44,062 122.515 8.2 2.1 tectonic stresses.
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