Table 1 Effusion rate, cumulative erupted volume, and content of pyroclastic rocks estimated by the topographic method using ALOS-2 images
Eposide 4/stage | Date | Term (day) | Effusion rate | Cumurative erupted volume (m3) | Content percentage of pyroclastic rocks (%) | |
|---|---|---|---|---|---|---|
(m3 day-1) | (m3 s−1) | |||||
Stage 1 | 5 Dec 2019–6 Dec 2019 | 1 | 380,000 | 4.40 | 428,000 | 14 |
7 Dec 2019–20 Dec 2019 | 14 | 501,000 | 5.80 | 7,570,000 | 6 | |
21 Dec 2019–3 Jan 2020 | 14 | 389,000 | 4.50 | 13,100,000 | 13 | |
4 Jan 2020–17 Jan 2020 | 14 | 415,000 | 4.80 | 18,900,000 | 15 | |
18 Jan 2020–31 Jan 2020 | 14 | 496,000 | 5.74 | 26,100,000 | 3 | |
1 Feb 2020–14 Feb 2020 | 14 | 379,000 | 4.38 | 31,500,000 | 5 | |
15 Feb 2020–28 Feb 2020 | 14 | 371,000 | 4.29 | 36,900,000 | 2 | |
1 Mar 2020–13 Mar 2020 | 14 | 379,000 | 4.39 | 42,300,000 | 4 | |
14 Mar 2020–27 Mar 2020 | 14 | 390,000 | 4.52 | 47,900,000 | 4 | |
28 Mar 2020–24 Apr 2020 | 28 | 319,000 | 3.69 | 57,100,000 | 3 | |
25 Apr 2020–8 May 2020 | 14 | 598,000 | 6.92 | 65,700,000 | 1 | |
9 May 2020–22 May 2020 | 14 | 563,000 | 6.52 | 73,800,000 | 4 | |
23 May 2020–5 Jun 2020 | 14 | 670,000 | 7.75 | 83,400,000 | 4 | |
6 Jun 2020–19 Jun 2020 | 14 | 559,000 | 6.46 | 91,400,000 | 7 | |
20 Jun 2020–29 Jun 2020 | 10 | 2,190,000 | 25.30 | 113,000,000 | 45 (69*) | |
Stage 2 | 30 Jun 2020–3 Jul 2020 | 4 | 2,610,000 | 30.20 | 123,000,000 | 45 (73*) |
4 Jul 2020–17 Jul 2020 | 14 | 523,000 | 6.06 | 130,000,000 | 75 (88*) | |
18 Jul 2020–31 Jul 2020 | 14 | 187,000 | 2.16 | 132,000,000 | 100 | |
Stage 3 | 1 Aug 2020–14 Aug 2020 | 14 | 8210 | 0.10 | 132,000,000 | 100 |
15 Aug 2020–20 Aug 2020 | 6 | 16,400 | 0.19 | 132,000,000 | 100 | |