Re-evaluation of the activity of the Thoen Fault in the Lampang Basin, northern Thailand, based on geomorphology and geochronology

Earth, Planets and Space

Table 1 Parameters for calculating the ratio of Valley floor width to Valley height (Vf) in the southeastern Lampang Basin.

Sop prap area/Stream name and location (No.)
	Vfw (m)	Eld (m)	Erd (m)	Esc (m)	Vf
Huai Mae So (1)	104	480	460	360	0.95
Huai Samai (2)	100	380	360	300	1.40
Huai Som (3)	160	360	380	260	1.45
Huai Pa Phai (4)	76	340	360	300	1.52
Huai Mae Wa (5)	110	340	340	300	2.75
Huai Kom Ko (6)	81	360	380	300	1.16
Huai Mae Thok Noi (7)	76	380	360	300	1.09
Ban Mai Area/Stream name and location (No.)
	Vfw (m)	Eld (m)	Erd (m)	Esc (m)	Vf
Huai Sam Kha1 (8)	45	420	400	380	1.50
Huai Sam Kha2 (9)	87	560	600	380	0.44
Huai Mae Sapao (10)	119	580	560	380	0.63
Huai Mae Iak (11)	105	520	580	360	0.55
Huai Mae Mai (12)	67	350	460	340	1.03
Huai Mae Tap (13)	66	480	460	360	0.60

Remarks
Vfw = Width of the valley floor (m). Esc = Elevation of valley floor (m). Eld = Elevation of left valley divide (m). Vf = Ratio of valley floor width to valley height. Erd = Elevation of right valley divide (m). Smf = Mountain-front sinuosity. Locations of streams are shown in Fig. 8.