My next piece of good fortune work in this environment, and I have His experimental ultrasonic results came in being accepted as a postdoc­ no hesitation in saying that a con­ and his clarification, with S.K. Garg, toral fellow at Harvard by Francis siderable part of the credit for any of the effective stress law showed Birch. I count the eighteen months successes that may have come my that the opening of dry cracks, rather spent in his laboratory as the most way is shared by my colleagues. than an increase in effective stress, stimulating and rewarding of my ca­ It was very satisfying in recent was responsible for the decrease of reer. Thence in 1959 to Canberra, years to have played a role in per­ velocity ratios in the crust prior to where a new university containing a suading the university to recognize earthquakes. The dilatancy hypoth­ Department of Geophysics was in the the intrinsic importance of the earth esis is now the working framework making. The Australian National Uni­ sciences. As a result, there will be a for much of the earthquake predic­ versity showed great wisdom in pick­ major expansion and diversification tion research in this country. ing John Jaeger as its foundation of earth science research in Canberra With his co-workers R. Kovach, J. professor of geophysics. He knew during the coming years. We are Booker, and A. Johnson, he has clari­ instinctively how to create a good looking forward with much excite­ fied the role of pore fluids and pore research environment and how to ment to these developments. pressures in a variety of geophysical inspire an enthusiastic group of Thank you, Joe Boyd, for your and tectonic contexts, including fault young researchers. The spirit and generous introduction. It is a great creep, aftershocks, and low-velocity vigour of this group over the years pleasure to accept this Bowie Medal zones. With S. Garg he has reformu­ has been excellent, and there has on behalf of my colleagues as well as lated and clarified the effective stress been considerable cross-fertilization myself. law. By combining the disciplines of of ideas and collaboration in joint Thank you all very much indeed. rock mechanics, hydraulics, and seis­ projects, often of an interdisciphnary mology, he has provided a bridge nature. It has been a privilege to A.E. Ringwood between laboratory and field obser­ vations as they relate to the interpre­ tation of seismic velocities and pro­ cesses in the focal region of earthquakes. In addition to his contributions to Thirteenth Presentation tectonophysics and seismology, he has also done experimental work on JAMES B. MACELWANE granular material to help explain lunar data on the regolith. He has AWARD published thirty papers since 1968.

Don L. Anderson to (Read by A.J. Dessler)

AMOS M. NUR

Acceptance and Response I am very grateful and honored to receive the Macelwane Award. When I was first told about it I was natural­ in recognition of significant contributions ly very pleased, but soon afterward I to the geophysical sciences by a realized that there is a snag-I have to young scientist of outstanding ability give a little speech in response. What do you say on such an oc­ casion? At a loss, I went back and MOS NUR was born in Haifa, Is­ elect of the Tectonophysics Section read past AGU speeches for awards Arael, in 1938 and received his of the American Geophysical Union. in various sections. I discovered that early education in Israel and Switzer­ His research interests include the they all had one thing in common; land. He received his B.Sc. in Geology physical properties of rocks, process­ every one of the speakers thanked his in 1962 at the Hebrew University, Je­ es in the crust and mantle, paleomag- teachers, his peers, and his students rusalem, and his Ph.D. in Geophysics netism, heat flow, and earthquake for their invaluable contributions to from MIT in late 1969. Between prediction. the work for which the award was 1957 and 1963 he served with the His discovery of velocities in low- given. Israeli army, explored for minerals in porosity crystalline rocks, in particu­ Well, this is exactly what I myself southern Israel, and did geological lar the role of pore fluids, provided had in mind to say. Why is this? Are mapping in the Swiss Alps. Since the conceptual framework for ex­ we all just so polite? Knowing some 1970 he has been an assistant profes­ plaining precursory phenomena of of the past recipients of this award, I sor in the Geophysics Department at earthquakes and led to the Nur hy­ had to dismiss this explanation Stanford University. He is president- pothesis of earthquake prediction. quickly, of course. I think the cor- rect explanation is that extensive So now when I thank my teach­ cooperation in geophysics, and earth ers, colleagues, and students, I do so sciences in general, is not only a nice with the clear knowledge that their AGU thing to have but is actually an essen­ scientific activities are inseparable tial aspect of what we must consider from the work for which this award as our present 'scientific revolution.' is given. I therefore accept this WATER Joining efforts is, perhaps unlike in award, representing a large group of other sciences, an absolutely neces­ scientists, and consider it as a confir­ RESOURCES sary condition for our progress. Be­ mation of the success of their joint cause we deal with broad interdisci­ efforts. plinary studies, no one can make Thank you. MONOGRAPH 3 much progress unless many make some progress. Amos Nur Outdoor Sixth Presentation Recreation

WALTER H. BUCHER and Water MEDAL Resources to

MAURICE EWING Planning

In recent years outdoor recreation for original contributions to the and the consideration of environ­ mental amenities have taken on basic knowledge of the earth's crust great importance in the planning of water resources. The result has been a growing need to ade­ AURICE EWING was born in A year or two ago, his native state quately provide for these con­ MTexas in 1906. He had all his called him to organize a new oceano­ cerns. This volume sets forth the collegiate and university training at graphic institution for the University major principles that should be Rice University, where he received of Texas. We may be sure that his followed and suggests practical methods for their implementa­ the doctorate in physics in 1931. stimulating work will continue in this tion. He first taught at Pittsburgh and new environment. Lehigh Universities in the days when Maurice has been honored on Please send me copy(ies) research grants were few, small, and many occasions for his contributions of Outdoor Recreation and Wa­ hard to come by. He was able, in many fields. Our committee, how­ ter Resources Planning. Orders though, to wangle some support for ever, felt that his work on earth amounting to less than $10 must seismic profiling of the Coastal Plain, structure has been so in the tradition be prepaid. with fascinating but tantalizing re­ of Walter Bucher that the award to sults. What does the continental shelf him of the Bucher Medal is singularly • Enclosed is $ look like? in good order. After research during World War Mr. President, your committee • Please bill me II on the acoustics of the sea, he had unanimously and enthusiastically his chance to find out. Made head of commend to you Maurice Ewing for Ship to: the new Lamont Geological Observa­ the award of the Bucher Medal. tory of Columbia University, he was James Gilluly Name finally able to get the support, in ships and equipment—much of which (Read by Frank Press) he designed himself—for research on Address . the ocean floor. To Ewing, oceanography meant everything from the physical proper­ On May 4, 1974, Maurice Ewing zip code ties of sea water to the structure of died after a brief illness. Professor the ocean floor, from the causes of Ewing was president of AGU from Published by AGU glacial ages to the determination of 1707 LSt., N.W. 1956 to 1959. He will be deeply Washington, D.C. 20036 the Pleistocene-Holocene boundary, missed by all who knew him and his from turbidity currents to sea floor outstanding contributions to geo­ PAPERBACK • LIST PRICE $3.50 spreading. physics. (Ed.) Jack L. Knetsch _