Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.1 on date 01-04-2018 and time 00:39:43 (Italy) in region 4 km NW Castiglione d'Orcia (SI)

A magnitude ML 2.1 earthquake occured in region: 4 km NW Castiglione d'Orcia (SI), on

  • 31-03-2018 22:39:43 (UTC)
  • 01-04-2018 00:39:43 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.0230, 11.5780 at 10 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
Castiglione d'Orcia SI 4 2346 2346
San Quirico d'Orcia SI 5 2662 5008
Montalcino SI 8 5093 10101
Pienza SI 10 2107 12208
Seggiano GR 11 961 13169
San Giovanni d'Asso SI 15 853 14022
Castel del Piano GR 15 4690 18712
Buonconvento SI 15 3173 21885
Arcidosso GR 17 4285 26170
Abbadia San Salvatore SI 18 6444 32614
Montepulciano SI 18 14097 46711
Trequanda SI 20 1254 47965

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km SE of Siena (53903 inhabitants)
48 Km NE of Grosseto (82087 inhabitants)
55 Km SW of Arezzo (99543 inhabitants)
67 Km W of Perugia (166134 inhabitants)
80 Km NW of Viterbo (67173 inhabitants)
87 Km SE of Firenze (382808 inhabitants)
88 Km SE of Scandicci (50609 inhabitants)
92 Km W of Foligno (57155 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 2.1 2018-03-31
22:39:43		 43.0228 11.5775 10 2019-04-24
14:49:50		 Bollettino Sismico Italiano INGV 66163161
Reviewed
Rev100 		ML 2.0 2018-03-31
22:39:43		 43.0162 11.5767 10 2018-03-31
22:48:33		 Sala Sismica INGV-Roma 55008271
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-03-31 22:39:43 ± 0.13
Latitude 43.0228 ± 0.0081
Longitude 11.5775 ± 0.0086
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 66163161

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 782
Semi-minor axis of confidence ellipse (meter) 710
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 186
Circular confidence region, given by single value of horizontal uncertainty (meter) 780.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 61
Number of associated phases, regardless of their use for origin computation 36
Number of defining phases 36
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.38
Epicentral distance of station closest to the epicenter (degree) 0.17087
Epicentral distance of station farthest from the epicenter (degree) 0.86515
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 24
Magnitudes information

ML:2.1

Field Value
Value 2.1
Uncertainty 0.3
Num. used stations 40
Type of magnitude ML
Reference to an origin 66163161
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2019-03-04 16:52:37

ML:2.0

Field Value
Value 2.0
Uncertainty 0.2
Num. used stations 35
Type of magnitude ML
Reference to an origin 55008271
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-03-31 22:48:33
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MURB.HHZ. 2018-03-31T22:40:08.79 0.6 undecidable manual S 71 81.1521 50 0.51 41
IV.ATMI.HHZ. 2018-03-31T22:40:04.07 1.0 undecidable manual S 58 65.6898 50 -0.08 23
IV.CSNT.HHZ. 2018-03-31T22:40:00.38 0.6 undecidable manual S 335 55.1004 50 -0.94 36
IV.PIEI.HHZ. 2018-03-31T22:40:00.85 0.6 undecidable manual P 53 96.0261 50 0.59 39
IV.PARC.HHZ. 2018-03-31T22:39:59.05 0.3 undecidable manual P 37 87.5457 50 0.09 67
IV.APEC.HHZ. 2018-03-31T22:39:59.62 0.6 undecidable manual P 49 90.3429 50 0.23 43
IV.MGAB.HHZ. 2018-03-31T22:39:58.29 0.3 undecidable manual S 106 45.1215 50 -0.36 68
IV.ATPI.EHZ. 2018-03-31T22:39:58.24 0.1 undecidable manual P 54 81.8514 50 0.17 88
IV.RIBO.EHZ. 2018-03-31T22:39:58.00 0.6 undecidable manual S 259 43.8228 50 -0.32 46
IV.SSP9.EHZ. 2018-03-31T22:39:57.70 0.6 undecidable manual P 36 75.7686 50 0.56 41
IV.MURB.HHZ. 2018-03-31T22:39:57.95 1.0 undecidable manual P 71 81.1521 50 -0.02 23
IV.CAFI.HHZ. 2018-03-31T22:39:57.66 0.6 undecidable manual S 43 46.3203 50 -1.32 30
IV.ATVO.HHZ. 2018-03-31T22:39:57.60 0.1 undecidable manual P 59 77.9664 50 0.12 90
IV.BADI.EHZ. 2018-03-31T22:39:57.17 0.6 undecidable manual P 45 76.2681 50 -0.05 46
IV.ATMI.HHZ. 2018-03-31T22:39:56.88 0.6 undecidable manual P 58 65.6898 50 1.3 30
IV.CASP.HHZ. 2018-03-31T22:39:55.98 0.6 undecidable manual P 246 63.3921 50 0.75 39
IV.TRIF.HHZ. 2018-03-31T22:39:54.86 0.6 undecidable manual P 281 55.5999 50 0.82 38
IV.OSSC.HHZ. 2018-03-31T22:39:54.47 0.1 undecidable manual P 334 61.6938 50 -0.5 85
IV.CSNT.HHZ. 2018-03-31T22:39:53.34 0.1 undecidable manual P 335 55.1004 50 -0.61 83
IV.MCIV.HHZ. 2018-03-31T22:39:53.37 0.6 undecidable manual S 163 28.2495 50 -0.79 40
IV.RIBO.EHZ. 2018-03-31T22:39:52.54 0.1 undecidable manual P 259 43.8228 50 0.31 92
TV.SF01.EHZ. 2018-03-31T22:39:52.26 0.6 undecidable manual S 183 23.4543 113 -0.45 46
TV.SF03.EHZ. 2018-03-31T22:39:52.79 0.3 undecidable manual S 160 25.9518 111 -0.73 62
IV.CAFI.HHZ. 2018-03-31T22:39:52.17 0.1 undecidable manual P 43 46.3203 50 -0.43 89
IV.MGAB.HHZ. 2018-03-31T22:39:52.21 0.3 undecidable manual P 106 45.1215 50 -0.2 70
TV.SF04.EHZ. 2018-03-31T22:39:51.81 0.6 undecidable manual S 162 21.867 114 -0.39 47
IV.FROS.HHZ. 2018-03-31T22:39:51.60 0.1 undecidable manual P 301 39.9267 50 -0.02 98
IV.SACS.HHZ. 2018-03-31T22:39:51.60 0.1 undecidable manual P 125 33.1446 50 1.03 72
IV.ARCI.HHZ. 2018-03-31T22:39:51.81 0.6 undecidable manual S 204 20.6682 115 -0.03 51
TV.SF11.HHZ. 2018-03-31T22:39:50.95 0.3 undecidable manual S 154 18.9699 117 -0.36 71
IV.MCIV.HHZ. 2018-03-31T22:39:49.95 0.1 undecidable manual P 163 28.2495 50 0.13 98
TV.SF01.EHZ. 2018-03-31T22:39:49.17 0.1 positive manual P 183 23.4543 113 0.19 98
TV.SF03.EHZ. 2018-03-31T22:39:49.51 0.1 undecidable manual P 160 25.9518 111 0.06 100
IV.ARCI.HHZ. 2018-03-31T22:39:48.67 0.1 undecidable manual P 204 20.6682 115 0.19 98
TV.SF04.EHZ. 2018-03-31T22:39:48.87 0.1 undecidable manual P 162 21.867 114 0.18 98
TV.SF11.HHZ. 2018-03-31T22:39:48.49 0.3 undecidable manual P 154 18.9699 117 0.31 72
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
TV.SF04.EHE. ML:2.9 0.0057350000000000005 1.82 AML other m 2018-03-31T22:39:53.96
TV.SF01.EHE. ML:2.4 0.0017250000000000002 0.3 AML other m 2018-03-31T22:39:53.66
TV.SF01.EHN. ML:2.6 0.0022649999999999997 0.26 AML other m 2018-03-31T22:39:53.50
IV.ARCI.HHN. ML:2.0 0.000752 0.3 AML other m 2018-03-31T22:39:53.66
IV.ARCI.HHE. ML:1.9 0.000628 0.72 AML other m 2018-03-31T22:39:54.92
IV.MCIV.HHN. ML:2.3 0.0010045 0.92 AML other m 2018-03-31T22:39:54.39
IV.MCIV.HHE. ML:2.2 0.00086 1.76 AML other m 2018-03-31T22:39:54.89
IV.CAFI.HHN. ML:1.8 0.00019600000000000002 0.28 AML other m 2018-03-31T22:39:58.75
IV.CAFI.HHE. ML:2.0 0.000284 0.4 AML other m 2018-03-31T22:39:58.77
IV.CAFI.HNE. ML:2.0 0.0002807981 0.8832 AML other m 2018-03-31T22:39:58.77
IV.SACS.HHN. ML:1.7 0.00021750000000000003 0.62 AML other m 2018-03-31T22:39:59.15
IV.SACS.HNN. ML:1.7 0.0002085 0.64 AML other m 2018-03-31T22:39:59.15
IV.FROS.HHN. ML:2.0 0.0003635 1.34 AML other m 2018-03-31T22:39:59.68
IV.SACS.HNE. ML:1.8 0.000245 0.28 AML other m 2018-03-31T22:39:59.66
IV.SACS.HHE. ML:1.8 0.000241 0.28 AML other m 2018-03-31T22:39:59.66
IV.CAFI.HNN. ML:1.8 0.00019254235 0.1888 AML other m 2018-03-31T22:39:59.75
IV.MGAB.HNN. ML:2.0 0.0003005 0.16 AML other m 2018-03-31T22:40:00.30
IV.MGAB.HHN. ML:2.0 0.00029200000000000005 1.34 AML other m 2018-03-31T22:40:00.30
IV.CSNT.HHN. ML:1.9 0.00019600000000000002 0.82 AML other m 2018-03-31T22:40:01.49
IV.CSNT.HHE. ML:2.0 0.000228 0.2 AML other m 2018-03-31T22:40:01.15
IV.FROS.HHE. ML:2.0 0.00038700000000000003 0.7 AML other m 2018-03-31T22:40:01.11
IV.MGAB.HHE. ML:2.0 0.0002895 0.76 AML other m 2018-03-31T22:40:02.61
IV.MGAB.HNE. ML:1.9 0.0002545 0.32 AML other m 2018-03-31T22:40:02.61
IV.ATMI.HHE. ML:2.4 0.000503 0.24 AML other m 2018-03-31T22:40:04.53
IV.ATMI.HHN. ML:2.7 0.000926 0.3 AML other m 2018-03-31T22:40:05.71
IV.MURB.HNN. ML:3.2 0.00215 0.3 AML other m 2018-03-31T22:40:10.16
IV.MURB.HHN. ML:3.2 0.002175 0.3 AML other m 2018-03-31T22:40:10.16
IV.MURB.HHE. ML:3.0 0.0012250000000000002 0.3 AML other m 2018-03-31T22:40:10.65
IV.MURB.HNE. ML:2.9 0.0010065 1.04 AML other m 2018-03-31T22:40:10.66
IV.BADI.EHN. ML:2.0 0.0001625 0.62 AML other m 2018-03-31T22:40:11.10
IV.ATPI.EHE. ML:2.0 0.00011800000000000001 0.82 AML other m 2018-03-31T22:40:12.65
IV.ATVO.HHE. ML:2.0 0.00015250000000000002 1.08 AML other m 2018-03-31T22:40:12.94
IV.ATVO.HHN. ML:2.0 0.00013025 0.44 AML other m 2018-03-31T22:40:12.25
IV.ATPI.EHN. ML:2.0 0.00014049999999999997 0.5 AML other m 2018-03-31T22:40:13.10
IV.PARC.HHE. ML:2.0 0.000112 1.38 AML other m 2018-03-31T22:40:13.28
IV.APEC.HHE. ML:2.1 0.000154 0.62 AML other m 2018-03-31T22:40:15.96
IV.APEC.HHN. ML:2.1 0.00015000000000000001 0.66 AML other m 2018-03-31T22:40:16.50
IV.PARC.HHN. ML:2.0 0.0001358 0.46 AML other m 2018-03-31T22:40:16.87
IV.PIEI.HHN. ML:1.9 0.00008319999999999999 0.52 AML other m 2018-03-31T22:40:17.40
IV.PIEI.HHE. ML:1.8 0.0000614 1.3 AML other m 2018-03-31T22:40:18.13
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