Assessment of Landslide Susceptibility by Decision Trees in the Metropolitan Area of Istanbul, Turkey

Table 1

The distribution of the geological formations with respect to landslide in the study area.

Formation	Symbol	Grid cells with landslides		All grid cells		LandslideDensity (%)
		Frequency	%	Frequency	%
Quaternary	Qa	1127	2.1	15495	5.54	7.27
Bakirkoy fm.	Tmb	4473	8.34	56231	20.1	7.95
Ergene fm.	Tme	13617	25.37	71287	25.49	19.1
Cantakoy fm.	Toc	5706	10.63	14210	5.08	40.15
Danisment fm.	Tod	4728	8.81	20650	7.38	22.9
Ihsaniye fm.	Teoi	1810	3.37	43337	15.49	4.18
Kirklareli limestone	Tek	0	0	1613	0.58	0
Danisment fm. Acmalar m.	Toda	17151	31.95	34213	12.23	50.13
Ihsaniye fm. Tuff m.	Teoi2	66	0.12	478	0.17	13.81
Suloglu fm.	Tos	4996	9.31	21166	7.57	23.6
Yassioren limestone	Teoiy	0	0	1035	0.37	0