Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.2 on date 26-02-2018 and time 03:32:31 (Italy) in region Piancastagnaio (SI)

A magnitude ML 2.2 earthquake occured in region: Piancastagnaio (SI), on

  • 26-02-2018 02:32:31 (UTC)
  • 26-02-2018 03:32:31 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8480, 11.6900 at 7 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Piancastagnaio SI 0 4230 4230
Abbadia San Salvatore SI 4 6444 10674
Castell'Azzara GR 8 1476 12150
Radicofani SI 8 1097 13247
Santa Fiora GR 9 2622 15869
Arcidosso GR 13 4285 20154
Castel del Piano GR 13 4690 24844
Seggiano GR 14 961 25805
Proceno VT 15 557 26362
San Casciano dei Bagni SI 15 1632 27994
Roccalbegna GR 16 1044 29038
Semproniano GR 18 1059 30097
Castiglione d'Orcia SI 18 2346 32443
Acquapendente VT 18 5506 37949
Sorano GR 19 3428 41377
Onano VT 20 995 42372

Municipalities with at least 50000 inhabitants

An earthquake occurred to
48 Km E of Grosseto (82087 inhabitants)
59 Km NW of Viterbo (67173 inhabitants)
60 Km SE of Siena (53903 inhabitants)
64 Km W of Perugia (166134 inhabitants)
71 Km S of Arezzo (99543 inhabitants)
84 Km W of Foligno (57155 inhabitants)
84 Km N of Civitavecchia (52991 inhabitants)
85 Km W of Terni (111501 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 2.2 2018-02-26
02:32:31		 42.8482 11.6897 7 2019-04-24
14:49:28		 Bollettino Sismico Italiano INGV 56003721
Reviewed
Rev100 		ML 2.2 2018-02-26
02:32:31		 42.8503 11.6892 7 2018-02-26
02:53:46		 Sala Sismica INGV-Roma 54164821
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-02-26 02:32:31 ± 0.06
Latitude 42.8482 ± 0.0045
Longitude 11.6897 ± 0.0049
Depth (km) 7 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 56003721

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 451
Semi-minor axis of confidence ellipse (meter) 373
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 177
Circular confidence region, given by single value of horizontal uncertainty (meter) 450.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 55
Number of associated phases, regardless of their use for origin computation 36
Number of defining phases 33
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.99825
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 21
Magnitudes information

ML:2.2

Field Value
Value 2.2
Uncertainty 0.3
Num. used stations 24
Type of magnitude ML
Reference to an origin 56003721
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2018-04-23 15:42:39

ML:2.2

Field Value
Value 2.2
Uncertainty 0.3
Num. used stations 30
Type of magnitude ML
Reference to an origin 54164821
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-02-26 02:53:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MSSA.HHZ. 2018-02-26T02:33:40.49 3.0 undecidable manual Sg 3.66 0
IV.CPOZ.HHZ. 2018-02-26T02:33:15.28 3.0 positive manual Pn -0.92 0
IV.T1214.EHZ. 2018-02-26T02:33:12.44 3.0 undecidable manual S 1.06 0
IV.RUFI.EHZ. 2018-02-26T02:32:51.22 0.1 undecidable manual P 353 110.8002 50 0.4 76
IV.CAFI.HHZ. 2018-02-26T02:32:50.39 0.3 undecidable manual S 23 57.8976 50 -0.22 66
IV.ARRO.EHZ. 2018-02-26T02:32:48.30 1.0 undecidable manual P 108 92.6406 50 0.27 20
IV.OSSC.HHZ. 2018-02-26T02:32:46.29 0.1 undecidable manual P 335 83.0502 50 -0.27 83
IV.CSNT.HHZ. 2018-02-26T02:32:45.10 0.1 undecidable manual P 335 76.4679 50 -0.44 81
IV.TRIF.HHZ. 2018-02-26T02:32:45.02 0.1 undecidable manual P 295 70.374 50 0.42 82
IV.CASP.HHZ. 2018-02-26T02:32:44.10 0.1 undecidable manual P 265 67.377 50 -0.04 90
IV.MGAB.HHZ. 2018-02-26T02:32:43.92 1.0 undecidable manual S 78 35.0427 102 -0.33 22
IV.MAON.HHZ. 2018-02-26T02:32:43.70 0.1 undecidable manual P 225 65.1903 50 -0.1 89
IV.FROS.HHZ. 2018-02-26T02:32:42.64 0.3 undecidable manual P 313 58.9965 50 -0.2 66
IV.RIBO.EHZ.01 2018-02-26T02:32:42.25 0.3 undecidable manual P 282 53.4021 50 0.26 66
IV.CAFI.HHZ. 2018-02-26T02:32:42.20 0.6 undecidable manual P 23 57.8976 50 -0.47 42
IV.LATE.HHE. 2018-02-26T02:32:41.46 0.6 undecidable manual S 160 27.6501 104 -0.27 46
IV.SACS.HHZ. 2018-02-26T02:32:38.90 0.6 undecidable manual S 90 17.871 112 0.39 46
IV.ARCI.HHN. 2018-02-26T02:32:38.49 0.3 undecidable manual S 271 17.4714 112 0.12 72
IV.MGAB.HHZ. 2018-02-26T02:32:38.66 0.3 undecidable manual P 78 35.0427 102 -0.34 67
IV.LATE.HHE. 2018-02-26T02:32:37.64 0.1 undecidable manual P 160 27.6501 104 0.09 95
TV.SF14.HHE. 2018-02-26T02:32:36.12 0.1 undecidable manual S -0.59 86
IV.SACS.HHZ. 2018-02-26T02:32:36.01 0.1 undecidable manual P 90 17.871 112 0.32 92
TV.SF01.EHZ. 2018-02-26T02:32:36.34 0.3 undecidable manual S 249 11.0778 123 -0.05 74
IV.MCIV.HHZ. 2018-02-26T02:32:35.47 0.3 undecidable manual S 188 7.7811 132 -0.03 75
IV.ARCI.HHN. 2018-02-26T02:32:35.74 0.1 undecidable manual P 271 17.4714 112 0.14 96
TV.SF13.HHE. 2018-02-26T02:32:35.17 0.1 undecidable manual S -0.02 99
TV.SF11.HHE. 2018-02-26T02:32:34.09 0.3 undecidable manual S 339 2.3976 161 -0.35 71
TV.SF13.HHE. 2018-02-26T02:32:34.06 0.1 undecidable manual P 0.29 94
TV.SF04.EHZ. 2018-02-26T02:32:34.21 0.3 undecidable manual S 240 2.7972 159 -0.27 72
IV.MCIV.HHZ. 2018-02-26T02:32:34.14 0.6 undecidable manual P 188 7.7811 132 0.19 48
TV.SF03.EHN. 2018-02-26T02:32:34.87 0.3 undecidable manual S 184 5.0949 145 0.01 76
TV.SF14.HHE. 2018-02-26T02:32:34.44 0.1 undecidable manual P -0.21 95
TV.SF01.EHZ. 2018-02-26T02:32:34.76 0.1 undecidable manual P 249 11.0778 123 0.3 94
TV.SF11.HHE. 2018-02-26T02:32:33.42 0.3 undecidable manual P 339 2.3976 161 0.08 75
TV.SF04.EHZ. 2018-02-26T02:32:33.54 0.1 undecidable manual P 240 2.7972 159 0.18 98
TV.SF03.EHN. 2018-02-26T02:32:33.86 0.1 undecidable manual P 184 5.0949 145 0.28 95
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
TV.SF04.EHE. ML:0.0 0.38238085 0.1216 AML other m 2018-02-26T02:32:34.41
TV.SF04.EHN. ML:0.0 0.50185435 0.1392 AML other m 2018-02-26T02:32:34.66
TV.SF01.EHN. ML:3.4 0.031240615 0.2192 AML other m 2018-02-26T02:32:36.47
TV.SF01.EHE. ML:3.5 0.04135484 0.2384 AML other m 2018-02-26T02:32:36.48
IV.SACS.HHN. ML:2.4 0.0024100735 0.4 AML other m 2018-02-26T02:32:40.26
IV.SACS.HHE. ML:2.4 0.002309367 0.32 AML other m 2018-02-26T02:32:40.52
IV.SACS.HNE. ML:2.4 0.0025267074999999997 0.32 AML other m 2018-02-26T02:32:40.52
IV.SACS.HNN. ML:2.4 0.002398124 0.4208 AML other m 2018-02-26T02:32:40.27
IV.MGAB.HHE. ML:2.3 0.0008196168000000001 0.3008 AML other m 2018-02-26T02:32:49.28
IV.MGAB.HNE. ML:2.3 0.00081432125 0.3408 AML other m 2018-02-26T02:32:49.28
IV.MGAB.HNN. ML:2.3 0.0007639537000000001 0.1792 AML other m 2018-02-26T02:32:44.64
IV.MGAB.HHN. ML:2.3 0.0007976091 0.1792 AML other m 2018-02-26T02:32:44.64
IV.CAFI.HNE. ML:1.8 0.00015319095 0.3008 AML other m 2018-02-26T02:32:51.67
IV.CAFI.HHN. ML:1.7 0.00011512758 0.36 AML other m 2018-02-26T02:32:50.87
IV.CAFI.HNN. ML:2.1 0.0002492251 1.04 AML other m 2018-02-26T02:32:48.06
IV.CAFI.HHE. ML:1.9 0.00015923095 0.3216 AML other m 2018-02-26T02:32:51.66
IV.MAON.HHN. ML:2.2 0.0002613285 0.32 AML other m 2018-02-26T02:32:56.20
IV.MAON.HHE. ML:2.2 0.0003063871 0.24 AML other m 2018-02-26T02:32:55.74
IV.CASP.HHE. ML:1.9 0.00014944484999999998 0.3184 AML other m 2018-02-26T02:32:57.57
IV.CASP.HHN. ML:1.9 0.00012990394999999998 0.4208 AML other m 2018-02-26T02:32:57.40
IV.CSNT.HHN. ML:2.2 0.00021570430000000001 0.3008 AML other m 2018-02-26T02:32:58.40
IV.CSNT.HHE. ML:2.0 0.00015572505 0.2992 AML other m 2018-02-26T02:32:58.84
IV.OSSC.HNE. ML:2.2 0.0001873303 0.9088 AML other m 2018-02-26T02:33:03.89
IV.OSSC.HHE. ML:2.0 0.00013619468500000002 0.2992 AML other m 2018-02-26T02:33:01.90
IV.OSSC.HNN. ML:2.2 0.0002267384 0.88 AML other m 2018-02-26T02:33:06.17
IV.OSSC.HHN. ML:2.1 0.00016277837000000002 0.36 AML other m 2018-02-26T02:33:01.73
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download
Waveforms Seismic signals in miniseed + resp format Download