Earthquake with magnitude of ML 1.2 on date 01-12-2019 and time 02:55:23 (Italy) in region 1 km W Radicofani (SI)

A magnitude ML 1.2 earthquake occured in region: 1 km W Radicofani (SI), on

  • 01-12-2019 01:55:23 (UTC)
  • 01-12-2019 02:55:23 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.9, 11.76 at 7 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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 10 1632 13403
Cetona SI 14 2755 16158
Sarteano SI 14 4717 20875
Castell'Azzara GR 14 1476 22351
Santa Fiora GR 16 2622 24973
Proceno VT 16 557 25530
Seggiano GR 17 961 26491
Castiglione d'Orcia SI 17 2346 28837
Castel del Piano GR 18 4690 33527
Arcidosso GR 18 4285 37812
Acquapendente VT 19 5506 43318
Chianciano Terme SI 19 7105 50423

Municipalities with at least 50000 inhabitants

An earthquake occurred to
54 Km E of Grosseto (82087 inhabitants)
57 Km W of Perugia (166134 inhabitants)
58 Km SE of Siena (53903 inhabitants)
60 Km NW of Viterbo (67173 inhabitants)
65 Km S of Arezzo (99543 inhabitants)
78 Km W of Foligno (57155 inhabitants)
82 Km W of Terni (111501 inhabitants)
89 Km N of Civitavecchia (52991 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Rev 100 ML 1.2 2019-12-01
01:55:23
42.9 11.76 7 2019-12-01
02:00:54
Sala Sismica INGV-Roma 74204321
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2019-12-01 01:55:23 ± 0.17
Latitude 42.90 ± 0.01
Longitude 11.76 ± 0.01
Depth (km) 7 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 74204321

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 822
Semi-minor axis of confidence ellipse (meter) 717
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 355
Circular confidence region, given by single value of horizontal uncertainty (meter) 820
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 214
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.09173
Epicentral distance of station farthest from the epicenter (degree) 0.28329
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 74204321
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2019-12-01 02:00:54
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ARCI.HHZ. 2019-12-01T01:55:31.88 0.6 undecidable manual S 258 0.2095 107 -0.31 47
TV.SF01.EHZ. 2019-12-01T01:55:30.38 0.6 undecidable manual S 240 0.1637 111 -0.13 49
IV.MCIV.CHZ. 2019-12-01T01:55:29.55 0.6 undecidable manual S 207 0.1304 116 0.23 48
IV.LATE.HHZ. 2019-12-01T01:55:29.97 0.6 positive manual P 173 0.2833 103 -0.23 47
IV.ARCI.HHZ. 2019-12-01T01:55:28.69 0.1 undecidable manual P 258 0.2095 107 0.08 98
TV.SF04.EHZ. 2019-12-01T01:55:27.93 0.6 undecidable manual S 230 0.0917 125 -0.12 50
TV.SF01.EHZ. 2019-12-01T01:55:27.79 0.1 positive manual P 240 0.1637 111 0.14 97
IV.SACS.HHZ. 2019-12-01T01:55:26.74 0.1 undecidable manual P 112 0.1214 118 -0.05 100
IV.MCIV.CHZ. 2019-12-01T01:55:26.92 0.1 positive manual P 207 0.1304 116 -0.04 100
TV.SF04.EHZ. 2019-12-01T01:55:26.36 0.1 positive manual P 230 0.0917 125 0.14 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
TV.SF04.EHE. ML:1.5 0.0005204312 0.08 AML other m 2019-12-01T01:55:28.51
TV.SF04.EHN. ML:1.7 0.000796506 0.0992 AML other m 2019-12-01T01:55:28.46
IV.SACS.HNN. ML:1.2 0.00016708325 0.7504 AML other m 2019-12-01T01:55:30.84
IV.SACS.HHE. ML:0.9 9.453676E-5 0.4 AML other m 2019-12-01T01:55:34.23
IV.SACS.HHN. ML:0.9 8.7531215E-5 0.2208 AML other m 2019-12-01T01:55:30.00
IV.MCIV.CHE. ML:1.2 0.00015953455 0.352 AML other m 2019-12-01T01:55:29.57
IV.MCIV.CHN. ML:1.3 0.00020771315 0.176 AML other m 2019-12-01T01:55:29.70
TV.SF01.EHE. ML:1.2 0.000139867795 0.32 AML other m 2019-12-01T01:55:31.95
TV.SF01.EHN. ML:1.2 0.0001474974 0.32 AML other m 2019-12-01T01:55:31.82
IV.ARCI.HNN. ML:1.3 0.000144339595 0.72 AML other m 2019-12-01T01:55:31.46
IV.ARCI.HHE. ML:0.9 5.504287E-5 0.3008 AML other m 2019-12-01T01:55:33.28
IV.ARCI.HHN. ML:1 6.206161E-5 0.2192 AML other m 2019-12-01T01:55:31.91
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