Did quark matter strike Earth?

The first event was recorded at seven monitoring stations in India, Australia, Bolivia and Turkey, and the second event was recorded at nine monitoring stations in Australia and Bolivia.

First event occurred on 22 October 1993, when, according to the researchers, something entered the Earth off Antarctica and left it south of India 0.73 of a second later.

The second occurred on 24 November 1993, when an object entered south of Australia and exited the Earth near Antarctica 0.15 of a second later.

Nothing..??

Unfortunately, scientists may not be able to find any more events that suggest the passage of strange quark matter through the Earth.

In 1993 the US Geological Survey stopped collecting data from "unassociated events."

I understand that. I was just curious if anything was ever made of it, any follow up or anything like that..

so, would this be an anomaly? http://www.physicsforums.com/showthread.php?t=58374 .. or more of a fluke?

what is quark matter?

Anderson et al. (2003) interpret a set of unassociated seismic arrivals observed on 24 November 1993 as a line source, which they claim is consistent with the passage of a "strange quark nugget" through the Earth. In fact, these arrivals can be convincingly interpreted as an earthquake source on the Pacific-Antarctic ridge.

What would quark matter do if it struck the Earth? And am I right in saying that a stable "nugget" would have to be incredibly dense (on the order of mountain sized masses per cubic centimetre?