Subsurface velocity structure and site amplification characteristics in Mashiki Town, Kumamoto Prefecture, Japan, inferred from microtremor and aftershock recordings of the 2016 Kumamoto earthquakes

Earth, Planets and Space

Table 3 Seismic velocity structures at KiK-net Mashiki station (KMMH16)

Layer no.	Thickness (m)	Depth (m)	V_P (m/s)	Density (kg/m³)	Vs (m/s)
Layer no.	Thickness (m)	Depth (m)	V_P (m/s)	Density (kg/m³)	PS logging	GOTO	This study
1	3	3	240	1220	110	110	110
2	6	9	380	1370	240	160	160
3	6	15	380	1370	240	370	370
4	18	33	1180	1820	500	600	600
5	8	41	1180	1820	400	425	425
6	28	69	1950	2060	760	570	551
7	32	101	2300	2150	820	615	517
8	32	133	2800	2260	1470	1103	564
9	10	143	2800	2260	700	525	415
10	26	169	2800	2260	1380	1035	587
11	32	201	2300	2150	840	630	392
12	33	234	2300	2150	1470	1103	1239
13	18^a	252^a	2300	2150	–	–	841
14	345^a	597^a	2300	2150	–	–	1470
15	608^a	1205^a	4800	2580	2700	2025	2700
16	1411^a	2616^a	5360	2650	–	–	3100
17	5000^a	7616^a	5700	2690	–	–	3300
18	–	–	6000	2730	–	–	3400