Table 1. Comparison of selected IOT deposits characteristics from Phang Nga province transects of tsunami run up height <6 m and >6 m.

transect No (Figs. 3 and 4)

2, 3, 4, 8

1, 5, 6, 7

No of samples analysed for grain size

27

64

average thickness [cm]

8.5

11.4

maximum thickness [cm]

35

40

most common trend of landward tsunami deposits thickness changes

one to three maxima: approximately 100 m from shoreline and >150 m from the shoreline

maximum in approximately 1/3 of the inundation distance or relatively uniform thick sediment blanket throughout the inundation zone

average and maximum (in brackets) % mud

1.5 (20.3)

2.8 (67.9)

average and maximum (in brackets) % gravel

28.7 (84.9)

11.8 (57.1)

range and average value (in brackets) of mean grain size [phi]

0.6–5.6 (3.14)

0.02–5.8 (2.38)

range and average value (in brackets) of grain size sorting [phi]

0.7–1.99 (1.33)

0.46–3.11 (1.33)

range and average value (in brackets) of grain size skew ness [phi]

−0.55–2.3 (1.0)

−1.4–4.7 (0.81)

range and average value (in brackets) of grain size kurtosis [phi]

2.5–16.6 (8.49)

1.4–60.9 (8.92)

% of sites with multiple layers within tsunami deposits

10%

41%

% of sites with massive layers^*

54

41

% of sites with normally graded layers^*

68

97

% of sites with laminated layers^*

10

25

preserved surface sedimentary bed forms

no

ripples and circular hollows

internal erosional contacts

no

in approximately 15% of sites