Earthquake with magnitude of ML 1.6 on date 31-08-2019 and time 20:56:37 (UTC) in region 1 km S Radicofani (SI)

A magnitude ML 1.6 earthquake occured in region: 1 km S Radicofani (SI), on

  • 31-08-2019 20:56:37 (UTC)
  • 31-08-2019 22:56:37 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.89, 11.77 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Radicofani SI 1 1097 1097
Abbadia San Salvatore SI 7 6444 7541
Piancastagnaio SI 7 4230 11771
San Casciano dei Bagni SI 9 1632 13403
Castell'Azzara GR 14 1476 14879
Cetona SI 14 2755 17634
Sarteano SI 14 4717 22351
Proceno VT 15 557 22908
Santa Fiora GR 16 2622 25530
Seggiano GR 18 961 26491
Castiglione d'Orcia SI 18 2346 28837
Acquapendente VT 18 5506 34343
Castel del Piano GR 19 4690 39033
Arcidosso GR 19 4285 43318
Allerona TR 19 1794 45112
Chianciano Terme SI 20 7105 52217

Municipalities with at least 50000 inhabitants

An earthquake occurred to
55 Km E of Grosseto (82087 inhabitants)
56 Km W of Perugia (166134 inhabitants)
59 Km NW of Viterbo (67173 inhabitants)
60 Km SE of Siena (53903 inhabitants)
65 Km S of Arezzo (99543 inhabitants)
77 Km W of Foligno (57155 inhabitants)
81 Km W of Terni (111501 inhabitants)
88 Km N of Civitavecchia (52991 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 1.6 2019-08-31
20:56:37
42.89 11.77 7 2019-11-13
14:31:08
Bollettino Sismico Italiano INGV 73535481
Reviewed
Rev100
ML 1.6 2019-08-31
20:56:37
42.89 11.76 8 2019-08-31
21:03:00
Sala Sismica INGV-Roma 71985151
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2019-08-31 20:56:37 ± 0.08
Latitude 42.89 ± 0.01
Longitude 11.77 ± 0.01
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 73535481

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 884
Semi-minor axis of confidence ellipse (meter) 471
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 176
Circular confidence region, given by single value of horizontal uncertainty (meter) 880
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 72
Number of associated phases, regardless of their use for origin computation 33
Number of defining phases 33
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.06655
Epicentral distance of station farthest from the epicenter (degree) 0.83457
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 18
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 18
Type of magnitude ML
Reference to an origin 73535481
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2019-10-31 18:14:10

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 18
Type of magnitude ML
Reference to an origin 71985151
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2019-08-31 21:03:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.PARC.HHZ. 2019-08-31T20:57:07.50 1.0 undecidable manual S 24 0.8346 50 1.4 13
IV.MURB.HHZ. 2019-08-31T20:57:01.80 1.0 undecidable manual S 56 0.6691 50 0.61 20
IV.RIBO.EHZ.01 2019-08-31T20:56:56.01 1.0 undecidable manual S 277 0.5297 50 -1.06 17
IV.ATTE.HHZ. 2019-08-31T20:56:56.80 0.6 undecidable manual S 54 0.5297 50 -0.26 45
IV.PARC.HHZ. 2019-08-31T20:56:54.36 0.3 undecidable manual P 24 0.8346 50 0.14 65
IV.TRIF.CHZ. 2019-08-31T20:56:51.94 0.3 undecidable manual P 290 0.67 50 0.53 62
IV.MURB.HHZ. 2019-08-31T20:56:51.18 0.6 undecidable manual P 56 0.6691 50 -0.2 44
IV.FROS.CHE. 2019-08-31T20:56:49.37 0.1 undecidable manual P 306 0.5495 50 0.04 94
IV.RIBO.EHZ.01 2019-08-31T20:56:49.37 0.3 undecidable manual P 277 0.5297 50 0.37 66
IV.LATE.HHZ. 2019-08-31T20:56:48.30 0.6 undecidable manual S 174 0.2752 103 -0.55 44
IV.ATTE.HHZ. 2019-08-31T20:56:48.55 0.3 undecidable manual P 54 0.5297 50 -0.45 65
IV.MGAB.HHZ. 2019-08-31T20:56:47.60 0.6 undecidable manual S 84 0.2545 104 -0.49 45
IV.CAFI.HNN. 2019-08-31T20:56:47.64 0.1 undecidable manual P 18 0.4649 50 -0.25 92
IV.ARCI.HHZ. 2019-08-31T20:56:46.00 0.6 undecidable manual S 261 0.2158 106 -0.63 43
TV.SF14.HHE. 2019-08-31T20:56:44.40 0.6 undecidable manual S 220 0.1727 110 -0.65 43
IV.LATE.HHZ. 2019-08-31T20:56:44.30 0.3 undecidable manual P 174 0.2752 103 0.04 75
IV.SACS.HHZ. 2019-08-31T20:56:44.10 0.6 undecidable manual S 110 0.1124 119 1.17 35
TV.SF01.EHZ. 2019-08-31T20:56:44.70 0.6 undecidable manual S 243 0.1664 111 -0.13 50
TV.SF13.HHE. 2019-08-31T20:56:43.50 0.6 undecidable manual S 237 0.1277 116 0.05 51
IV.MGAB.HHZ. 2019-08-31T20:56:43.41 0.1 undecidable manual P 84 0.2545 104 -0.41 92
IV.ARCI.HHZ. 2019-08-31T20:56:43.13 0.1 positive manual P 261 0.2158 106 0.16 98
IV.MCIV.CHZ. 2019-08-31T20:56:43.70 0.6 undecidable manual S 211 0.1268 116 0.27 49
TV.SF04.EHZ. 2019-08-31T20:56:42.30 0.3 undecidable manual S 236 0.0926 124 0 78
TV.SF01.EHZ. 2019-08-31T20:56:42.18 0.1 positive manual P 243 0.1664 111 0.24 97
TV.SF03.EHE. 2019-08-31T20:56:42.70 0.3 undecidable manual S 215 0.1034 121 0.08 76
IV.MCIV.CHZ. 2019-08-31T20:56:41.28 0.1 positive manual P 211 0.1268 116 0.15 100
TV.SF11.HHE. 2019-08-31T20:56:41.10 0.6 undecidable manual S 253 0.0665 133 -0.39 48
TV.SF14.HHE. 2019-08-31T20:56:41.76 0.1 undecidable manual P 220 0.1727 110 -0.31 96
TV.SF13.HHE. 2019-08-31T20:56:41.31 0.1 undecidable manual P 237 0.1277 116 0.17 100
IV.SACS.HHZ. 2019-08-31T20:56:41.07 0.1 undecidable manual P 110 0.1124 119 0.23 99
TV.SF04.EHZ. 2019-08-31T20:56:40.74 0.1 positive manual P 236 0.0926 124 0.27 98
TV.SF03.EHE. 2019-08-31T20:56:40.90 0.1 undecidable manual P 215 0.1034 121 0.23 99
TV.SF11.HHE. 2019-08-31T20:56:39.76 0.1 undecidable manual P 253 0.0665 133 -0.25 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MCIV.CHN. ML:2 0.0010415 0.38 AML other m 2019-08-31T20:56:44.30
IV.MCIV.CHE. ML:1.8 0.000763 0.78 AML other m 2019-08-31T20:56:44.94
TV.SF01.EHE. ML:1.8 0.0004925 0.26 AML other m 2019-08-31T20:56:45.31
IV.SACS.HHE. ML:1.5 0.000389 0.54 AML other m 2019-08-31T20:56:45.71
TV.SF01.EHN. ML:1.8 0.000495 0.24 AML other m 2019-08-31T20:56:46.22
IV.SACS.HHN. ML:1.4 0.0002875 0.58 AML other m 2019-08-31T20:56:47.70
IV.ARCI.HHN. ML:1.3 0.0001265 0.26 AML other m 2019-08-31T20:56:47.44
IV.ARCI.HHE. ML:1.3 0.0001395 0.36 AML other m 2019-08-31T20:56:47.86
IV.MGAB.HHN. ML:1.5 0.0001825 0.16 AML other m 2019-08-31T20:56:49.10
IV.MGAB.HNN. ML:1.5 0.0001658 0.98 AML other m 2019-08-31T20:56:49.10
IV.MGAB.HHE. ML:1.5 0.000159 1.12 AML other m 2019-08-31T20:56:50.91
IV.MGAB.HNE. ML:1.4 0.0001419 0.38 AML other m 2019-08-31T20:56:51.91
IV.LATE.HHE. ML:1.6 0.000204 0.26 AML other m 2019-08-31T20:56:51.98
IV.LATE.HHN. ML:1.7 0.0002535 0.7 AML other m 2019-08-31T20:56:52.31
IV.ATTE.HHN. ML:1.7 0.00010545 0.24 AML other m 2019-08-31T20:56:58.30
IV.ATTE.HHE. ML:1.6 8.745E-5 0.28 AML other m 2019-08-31T20:56:58.19
IV.MURB.HHN. ML:2.2 0.000248 0.3 AML other m 2019-08-31T20:57:04.55
IV.MURB.HHE. ML:2.1 0.0002035 0.26 AML other m 2019-08-31T20:57:05.24
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download