Todd,
HW (Heartland Wife) is very thorough and has been working on the area much more than I have the last decade...I was dabbling in it until our project finally really got started in the last couple of months.

Here are the references she just sent me. The titles tell you something about the quakes
Chris

Ambraseys, N. N. (2000). "The seismicity of the Marmara Sea area 1800-1899." Journal of Earthquake Engineering 4(3): 377-401.
The paper presents an extended summary of the most important earthquakes of the 19th century in the Marmara Sea region in north-west Turkey. We can find no evidence for a significant earthquake occuring during the first half of the 19th century, a period during which the west terminal of the North Anatolian fault system was much more active further west.This variation of activity with time of segments of fault zones, such as the Anatolian, is typical; the smaller the segment considered the longer the sampling period needed for moment rates and hazard estimates to be reliable. We find that the larger and some of the smaller events of the 19th century are clearly associated with known active faults which have generated earlier and later damaging earthquakes.

Ambraseys, N. N. (2001). "The earthquake of 1509 in the Sea of Marmara, Turkey, revisited." Bulletin of the Seismological Society of America 91(6): 1397-1416.

Ambraseys, N. N. (2001). "The earthquake of 10 July 1894 in the Gulf of Izmit (Turkey) and its relation to the earthquake of 17 August 1999." Journal of Seismology 5(1): 117-128.
The recent destructive earthquake (MS 7.4) of 17 August 1999 in the Gulf of Izmit in north-west Turkey was not a surprise, neither for its location, large magnitude or for the damage it caused. Other, equally large magnitude earthquakes have occurred in the past in the region but we have chosen to present in this paper the earthquake of 10 July 1894 because it is one of the two large events to strike the Gulf of Izmit in the last 105 years, and in many respects similar to the recent earthquake of 17 August 1999 in size, location, and effects.

Ambraseys, N. N. (2002). "The seismic activity in the Marmara Sea region over the last 2000 years." Bulletin of the Seismological Society of America 92(1): 1-18.
We examined the seismicity of the region of the Sea of Marmara in northwest Turkey over the last 2000 yr using the historical record of the region. We found no evidence for truly large earthquakes of a size comparable to those in the North Anatolian Fault zone in the Marmara Basin. Events are smaller in keeping with the known fault segmentation of the Basin. Over the last 2000 yr seismic moment release accounted for the known right-lateral shear velocity across the Marmara region observed by Global Positioning System measurements. Its average rate is relatively constant and varies between 1.6 and 2.4 cm/yr. The long-term seismicity in the Marmara Sea region shows that large earthquakes are less frequent than predicted from the 100-yr-long instrumental period.

Ambraseys, N. N. and C. F. Finkel (1987). "The Saros-Marmara earthquake of 9 August 1912." Journal of Earthquake Engineering ans Structural dynamics 15: 189-211.

Ambraseys, N. N. and C. F. Finkel (1990). "The Marmara Sea earthquake of 1509." Terra Nova 2: 167-174.

Ambraseys, N. N. and C. F. Finkel (1991). "Long-term seismicity of Istanbul and the Marmara Sea region." Terra Nova 3: 527-539.

Ambraseys, N. N. and C. F. Finkel (1995). The Seismicity of Turkey and Adjacent Areas - A Historical Review, 1500-1800. Istanbul, EREN.

Ambraseys, N. N. and J. A. Jackson (2000). "Seismicity of the Sea of Marmara (Turkey) since 1500." Geophysical Journal International 141: F1-F6.