2022年4月29日，美籍華人科學家、國際著名地球物理學家、哥倫比亞大學教授、原奧爾德里奇應(yīng)用地球物理實驗室主任，郭宗汾先生在美國紐約去世，享年100歲。

圖 1985年郭宗汾教授（右二）與重力組在白家疃北京國家地球觀象臺山洞調(diào)研

上世紀八十年代，由中國地震局地球物理研究所顧功敘教授和美國哥倫比亞大學郭宗汾（John T.Kuo）教授倡導(dǎo)的中美合作項目“局部重力場變化與地震發(fā)生的關(guān)系”立項。其研究宗旨是在京津唐張地區(qū)開展時變重力觀測，探索與地震發(fā)生有關(guān)的重力變化現(xiàn)象和機理，該工作為后來我國建立大陸地震時變重力監(jiān)測網(wǎng)絡(luò)系統(tǒng)奠定了研究基礎(chǔ)。

1976年唐山大地震后，時任美國哥倫比亞大學拉蒙特-多爾蒂地質(zhì)觀象臺的郭宗汾教授心系祖國，他多方籌集資金并帶著當時最先進的新型高精度重力儀器和成套設(shè)備來到我國華北地區(qū)，建立了8個具有連續(xù)觀測能力的重力臺站和流動觀重力重復(fù)觀測網(wǎng)，通過二十多年的研究獲得了京津唐張地區(qū)與地震發(fā)生有關(guān)的重力變化過程具有清晰的、一致的圖像。該項目成果也為研究局部重力場變化與地震之間關(guān)系的提供了寶貴的地球物理學依據(jù)。

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Cherish the memory of Professor John T. Kuo

April 29, 2022, Professor John T. Kuo, a Chinese American scientist, a world-famous geophysicist, a great professor at the Columbia University, and the former director of the Aldridge Laboratory of Applied Geophysics, passed away in New York, USA, at the age of 100.

We lost Professor John T. Kuo only days ago, but we have missed him for a long time. In the 1980s, the Sino-US cooperative project of "Relationship between local gravity field variation and earthquakes" was initiated by Professor John T. Kuo and Professor Gongxu Gu from Institute of Geophysics, China Earthquake Administration. The purpose of the project is to carry out time-varying gravity observations in Beijing-Tianjin-Tangshan-Zhangjiakou area, and to explore the mechanism of gravity variations related to the occurrence of earthquakes. This project laid the research foundations for the establishment of continental earthquake time-varying gravity monitoring network system in China.

After the Tangshan earthquake in 1976, Professor John T. Kuo, who was working at the Lamont–Doherty Earth Observatory at the Columbia University, had shown his love towards the motherland. He raised funds from various sources and bought lots of most advanced new high-precision gravity instruments in the world at that time for China, establishing 8 gravity stations with continuous monitoring capabilities and a mobile gravity repeated observation network system in the North China. He obtained clear and consistent images showing the gravity variation is related to the earthquake occurrence in Beijing-Tianjin-Tangshan-Zhangjiakou area, based on more than 20 years of research. The results of this project also provide valuable geophysical bases for studying the relationship between local gravity field variation and earthquakes.

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（重力與地殼形變研究室 供稿）