Table 1 Results of interview survey for coseismic change of the 2011 Iwaki earthquake and measurement and analysis results for hot spring water around the Iwaki area
From: Deep groundwater discharge after the 2011 Mw 6.6 Iwaki earthquake, Japan
No. | Location | Visit date | Coseismic change at Iwaki Eq. | Temp. (°C) | HCO3− (mg/L) | Cl− (mg/L) | SO42− (mg/L) | δ18O (‰) |
|---|---|---|---|---|---|---|---|---|
1 | Uchigo-takasakamachi1 (A) | 28 Apr. 2011 | Discharge | 26.9 | 267 | 88.9 | 475 | − 7.7 |
2 | Uchigo-takasakamachi2 | 19 Jun. 2014 | Discharge | 27.8 | 229 | 87.8 | 508 | − 7.8 |
3 | Mimayamachi | 22 Jun. 2011 | Discharge | 25.6 | 311 | 76.8 | 527 | − 7.6 |
4 | Izumi-tamatsuyu (B) | 18 May 2011 | Discharge | 56.1 | 190 | 1360 | 51.9 | − 6.9 |
5 | Yumoto | 28 Apr. 2011 | Water level increase | 58.3 | 107 | 702 | 377 | − 7.4 |
6 | Onahama | 28 Apr. 2011 | Water level increase | 14.0 | 312 | 216 | 239 | − 7.4 |
7 | Uchigo-kouyamachi | 28 Apr. 2011 | Water level increase | 15.8 | 189 | 3.5 | 12.9 | − 8.1 |
8 | Kawabemachi | 20 Apr. 2011 | Water level decrease | 10.6 | 223 | 4.4 | 19.5 | − 7.6 |
9 | Furudonomachi | 18 May 2011 | Water level decrease | 10.8 | 127 | 20.5 | 12.4 | − 9.9 |
10 | Nakosomachi | 20 Apr. 2011 | No change | 12.3 | 54.9 | 12.5 | 14.6 | − 7.6 |
11 | Joban-shiratorimachi | 6 Jun. 2011 | No change | 31.6 | 0.0 | 64.5 | 169 | − 7.5 |
12 | Toonomachi-taki | 6 Jun. 2011 | No change | 17.9 | 130 | 6.0 | 52.3 | − 7.6 |
13 | Toonomachi-oodaira | 20 Apr. 2011 | No change | – | – | – | – | – |
14 | Taira-yoshinoya | 22 Sep. 2011 | No change | – | – | – | – | – |