Table 2. Improvement in tsunami detection time due to the increase in number (L) of sensors for the optimal placement of sensors in Cotabato trench.

L	Detection time (s)	Improvement in time due to an additional sensor
1	224.9557	–
2	90.0057	134.9500
3	69.2824	20.7233
4	57.2515	12.0309
5	36.5071	20.7444
6	24.1509	12.3562
7	20.3382	3.8127
8	18.0073	2.331