Earthquake with magnitude of ML 1.5 on date 01-12-2021 and time 09:47:44 (UTC) in region 8 km W Campagnatico (GR)

A magnitude ML 1.5 earthquake occured in region: 8 km W Campagnatico (GR), on

  • 01-12-2021 09:47:44 (UTC)
  • 01-12-2021 10:47:44 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.863, 11.184 at 11 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
Campagnatico GR 8 2412 2412
Grosseto GR 13 82087 84499
Roccastrada GR 17 9199 93698
Civitella Paganico GR 17 3154 96852
Cinigiano GR 18 2618 99470

Municipalities with at least 50000 inhabitants

An earthquake occurred to
13 Km NE of Grosseto (82087 inhabitants)
52 Km S of Siena (53903 inhabitants)
88 Km SW of Arezzo (99543 inhabitants)
90 Km NW of Viterbo (67173 inhabitants)
99 Km NW of Civitavecchia (52991 inhabitants)
100 Km S of Scandicci (50609 inhabitants)
Recent and historical seismicity
Seismic hazard
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
ML 1.5 2021-12-01
42.8627 11.1845 11 2021-12-01
Sala Sismica INGV-Roma 98009281
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 2021-12-01 09:47:44 ± 0.11
Latitude 42.8627 ± 0.0081
Longitude 11.1845 ± 0.0049
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 98009281


Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 889
Semi-minor axis of confidence ellipse (meter) 313
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 11
Circular confidence region, given by single value of horizontal uncertainty (meter) 890
Confidence level of the uncertainty (%) 68


Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 150
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) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.1331
Epicentral distance of station farthest from the epicenter (degree) 0.56208
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information


Field Value
Value 1.5
Uncertainty 0.6
Num. used stations 4
Type of magnitude ML
Reference to an origin 98009281
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-01 10:00:14
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.TRIF.CHE. 2021-12-01T09:47:57.14 0.3 undecidable manual S 321 0.3256 50 0.04 73
IV.MAGO.CHZ. 2021-12-01T09:47:56.23 0.3 undecidable manual P 317 0.5621 50 0.22 67
IV.CASP.HHZ. 2021-12-01T09:47:54.75 0.3 undecidable manual S 253 0.2446 50 0.03 75
IV.ARCI.HNN. 2021-12-01T09:47:53.97 0.1 undecidable manual S 93 0.2131 50 0.18 97
IV.MCIV.CHE. 2021-12-01T09:47:52.64 0.1 undecidable manual P 103 0.3705 50 -0.08 96
IV.RIBO.EHZ.01 2021-12-01T09:47:51.44 0.3 undecidable manual S 311 0.1331 126 0.2 74
IV.TRIF.CHE. 2021-12-01T09:47:51.64 0.1 undecidable manual P 321 0.3256 50 -0.31 92
IV.CASP.HHZ. 2021-12-01T09:47:50.66 0.6 undecidable manual P 253 0.2446 50 0.09 49
IV.ARCI.HNN. 2021-12-01T09:47:49.92 0.3 undecidable manual P 93 0.2131 50 -0.12 74
IV.RIBO.EHZ.01 2021-12-01T09:47:48.45 0.1 undecidable manual P 311 0.1331 126 -0.12 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RIBO.EHN.01 ML:1.8 0.0006945 0.58 AML other m 2021-12-01T09:47:51.51
IV.RIBO.EHE.01 ML:2.1 0.001151559 0.224 AML other m 2021-12-01T09:47:51.62
IV.CASP.HHE. ML:0.9 4.7285905E-5 0.2816 AML other m 2021-12-01T09:47:54.73
IV.CASP.HHN. ML:1 5.9317535E-5 1.0368 AML other m 2021-12-01T09:47:56.50
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download