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Seismos

Corresponding author: chris.liner@gmail.com

Editor's note: Chris Liner is the author of Elements of 3-D Seismology, 2nd Edition (PennWell Publishing Co., 2004), and Greek Seismology (Samizdat Press). When not engaged in the serious business of research, he can often be caught playing with computers and reading really old books.

The first 20% of the full text of this article appears below.

I made the decision in India on the road from Dehradun, about three hours from Delhi. The driver honked and swerved into oncoming traffic as a 20 meter statue of Shiva stood peaceful watch over the Ganges. Here, half way round the world, I met an energetic and kind group of people, who knew me as the author of a column in THE LEADING EDGE.

Several were considerate enough to tell me privately they enjoyed and missed Seismos. I had heard this before in email or at a meeting somewhere in the U.S., but it made a deep impression to have it said here in the shadow of the Himalaya. This column appeared first in 1992 and last in 2002.

THE LEADING EDGE staff and editorial board were kind enough to leave an open door to the possibility of more columns during the last two years.

But Seismos withered in the heat of a major book project and other professional activities.

I was just about to write a wrap-up column, thank the readers, explain 10 years is enough, give Seismos a decent burial.

But that was before India. Before some of those new friends explained 1992 was the beginning of their career and they felt they had grown up with Seismos. So rather than disappoint the Indian subcontinent, let's see if we can find something interesting to talk about ...

	Broadband Fresnel zone

 
Most of the time we can get away with thinking about rays and reflection points. But a fundamental concept in seismology is that reflection does not actually arise from a single point on a reflector. It arises from an area called the Fresnel zone which is also the lateral resolution limit of unmigrated seismic data. By this we mean that two closely spaced . . . [Full Text of this Article]