Earthquake with magnitude of ML 3.3 on date 09-12-2019 and time 10:17:17 (Italy) in region 5 km N Scarperia e San Piero (FI)

A magnitude ML 3.3 earthquake occured in region: 5 km N Scarperia e San Piero (FI), on

  • 09-12-2019 09:17:17 (UTC)
  • 09-12-2019 10:17:17 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.01, 11.31 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
Scarperia e San Piero FI 6 12217 12217
Barberino di Mugello FI 6 10836 23053
Borgo San Lorenzo FI 9 18211 41264
Vaglia FI 12 5073 46337
Vernio PO 13 6060 52397
Firenzuola FI 13 4726 57123
Vicchio FI 15 8044 65167
Vaiano PO 16 9895 75062
Cantagallo PO 16 3105 78167
Castiglione dei Pepoli BO 19 5648 83815
Calenzano FI 20 17489 101304

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km NE of Prato (191150 inhabitants)
27 Km N of Firenze (382808 inhabitants)
30 Km NE of Scandicci (50609 inhabitants)
32 Km E of Pistoia (90315 inhabitants)
50 Km SW of Imola (69797 inhabitants)
54 Km S of Bologna (386663 inhabitants)
55 Km SW of Faenza (58541 inhabitants)
63 Km W of Forlì (117913 inhabitants)
67 Km E of Lucca (89046 inhabitants)
76 Km W of Cesena (96758 inhabitants)
76 Km NW of Arezzo (99543 inhabitants)
77 Km SE of Modena (184973 inhabitants)
77 Km N of Siena (53903 inhabitants)
80 Km E of Pisa (89158 inhabitants)
84 Km SW of Ravenna (159116 inhabitants)
86 Km E of Viareggio (62467 inhabitants)
92 Km SE of Carpi (70699 inhabitants)
93 Km E of Massa (69479 inhabitants)
94 Km SE of Reggio nell'Emilia (171345 inhabitants)
95 Km NE of Livorno (159219 inhabitants)
95 Km S of Ferrara (133155 inhabitants)
97 Km E of Carrara (63133 inhabitants)
Recent and historical Seismicity

These maps show the seismicity for different time windows. The earthquake locations reported in these maps are determined in quasi real-time by the personnel on duty in the seismic surveillance center of INGV in Rome. Note that the earthquake source parameters (hypocentral location and magnitude) are the best estimates obstained with the available data and they are adjourned as additional data become available. The source parameters obtained by the personnel on duty are then revised by the group in charge of the INGV Seismic Bulletin (Bollettino Sismico Italiano dell’INGV).

Earthquakes of the last three days (72 hours)

Earthquakes of the last three days (72 hours)

This map reports the earthquake epicenters located in the past 72 hours (3 days) from the time this page has been generated. The radius of the circle representing the earthquake on the map scales with magnitude. The color depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours). The open star shows the epicenter of the current earthquake.
Earthquakes of the last 90 days

Earthquakes of the last 90 days

This map reports the Magnitudo ≥ 1.0 earthquake epicenters located using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Earthquakes since 1985

Earthquakes since 1985

This map reports the Magnitudo ≥ 2.5 earthquake epicenters located using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2014

Earthquakes since 1000 AD until 2014

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version with estimated magnitude ≥ 5.0 since 1000 AD until 2014. The epicenters are represented by squares which sides scale with the estimated earthquake magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The open star shows the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy ( that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.

These three maps show the results of the analysis using the software ShakeMap designed to provide the level of ground shaking experienced in a region using the data recorded by seismometers and strong motion instruments and seismological information regarding the attenuation of the wavefield with distance and the site characteristics. The Shakemaps are determined for research purposes to provide fast estimates of the level of ground shaking produced by the earthquake. The maps are calculated automatically and adjourned progressively as more data become available. See for additional information.

The red star indicates the epicenter. The red triangles show the stations of the INGV Italian National Seismic Network and the blue triangles those of the Nationa Accelerometric Network of the Dipartimento della Protezione Civile.

Intensity Shakemap

Intensity Shakemap

This map shows the distribution of the istrumentally derived intensities. To this purpose, it is used a conversion relation between ground acceleration and velocity, and the Mercalli Modificata (MMI - Modified Mercalli Intensity) scale. In general, the Mercalli intensity scale relies on the effects that the ground shaking produces as reported by an observer.
Peak ground acceleration Shakemap

Peak ground acceleration Shakemap

This map shows This map shows the distribution of peak ground acceleration expressed as per cent of the acceleration of gravity (i.e., g = 9.81 m/s²).
Peak velocity Shakemap

Peak velocity Shakemap

This map shows the distribution of peak ground velocities expressed in cm/s.
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 ( 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 3.3 2019-12-09
44.01 11.31 7 2019-12-09
Sala Sismica INGV-Roma 74475231
Auto 1 ML-MED 3.3 2019-12-09
44.01 11.3 12 2019-12-09
Sistema Automatico Earthworm-10 74474651
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 2019-12-09 09:17:17 ± 0.09
Latitude 44.01 ± 0.01
Longitude 11.31 ± 0.01
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 74475231


Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 500
Semi-minor axis of confidence ellipse (meter) 437
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 336
Circular confidence region, given by single value of horizontal uncertainty (meter) 500
Confidence level of the uncertainty (%) 68


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 42
Number of defining phases 28
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.63492
Number of stations at which the event was observed 28
Number of stations from which data was used for origin computation 16
Magnitude information


Field Value
Value 3.3
Uncertainty 0.3
Num. used stations 66
Type of magnitude ML
Reference to an origin 74475231
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2019-12-09 09:22:56
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.PII.HHZ. 2019-12-09T09:17:41.25 0.1 undecidable manual S 243 0.6349 50 1.23 60
GU.GSCL.HHZ. 2019-12-09T09:17:40.32 0.6 undecidable manual S 304 0.6178 50 0.79 37
GU.CARD.HHZ. 2019-12-09T09:17:38.43 3.0 undecidable manual S -0.82 0
GU.GRAM.HHZ. 2019-12-09T09:17:37.79 3.0 negative manual P 0.18 0
IV.ATPI.EHZ. 2019-12-09T09:17:37.24 3.0 negative manual P 0.07 0
IV.CSNT.HHZ. 2019-12-09T09:17:37.29 3.0 undecidable manual S -0.29 0
IV.TRIF.CHZ. 2019-12-09T09:17:36.48 3.0 negative manual P 0.04 0
IV.BDI.HHZ. 2019-12-09T09:17:36.18 0.3 undecidable manual S 276 0.5153 50 -0.3 67
IV.MAGO.CHZ. 2019-12-09T09:17:35.40 3.0 negative manual P 0.25 0
IV.SSP9.EHZ. 2019-12-09T09:17:34.27 3.0 negative manual P 1.41 0
IV.FROS.CHZ. 2019-12-09T09:17:34.42 3.0 negative manual P 0.45 0
IV.BRIS.HHZ. 2019-12-09T09:17:33.34 0.1 undecidable manual S 57 0.3912 50 0.52 87
IV.SFI.EHZ. 2019-12-09T09:17:33.42 0.3 undecidable manual S 105 0.4011 50 0.31 68
GU.POPM.HHZ. 2019-12-09T09:17:32.46 0.1 undecidable manual S 275 0.3984 50 -0.55 85
IV.CPGN.EHZ. 2019-12-09T09:17:32.74 3.0 undecidable manual P -0.56 0
MN.VLC.HHZ. 2019-12-09T09:17:31.27 3.0 undecidable manual P -0.22 0
IV.CRE.HHZ. 2019-12-09T09:17:30.31 3.0 undecidable manual P -0.12 0
IV.CRMI.HHZ. 2019-12-09T09:17:30.13 0.1 undecidable manual S 228 0.3202 102 -0.41 90
GU.GSCL.HHZ. 2019-12-09T09:17:30.56 0.1 negative manual P 304 0.6178 50 0.16 90
IV.PII.HHZ. 2019-12-09T09:17:30.31 0.1 positive manual P 243 0.6349 50 -0.38 85
GU.CARD.HHZ. 2019-12-09T09:17:29.48 3.0 undecidable manual P -0.43 0
IV.LMD.HHZ. 2019-12-09T09:17:29.21 0.1 undecidable manual S 77 0.2941 103 -0.32 92
IV.BDI.HHZ. 2019-12-09T09:17:28.17 0.1 positive manual P 276 0.5153 50 -0.47 86
IV.CSNT.HHZ. 2019-12-09T09:17:28.76 3.0 positive manual P -0.21 0
IV.OSSC.HHZ. 2019-12-09T09:17:27.95 3.0 positive manual P -0.11 0
IV.ZCCA.HHZ. 2019-12-09T09:17:27.64 0.6 negative manual P 325 0.4146 50 0.71 40
IT.FIE.HGZ. 2019-12-09T09:17:26.23 0.3 undecidable manual S 183 0.2041 108 0.03 75
GU.POPM.HHZ. 2019-12-09T09:17:26.19 0.1 negative manual P 275 0.3984 50 -0.45 88
IV.BRIS.HHZ. 2019-12-09T09:17:26.49 0.1 positive manual P 57 0.3912 50 -0.04 96
IV.SFI.EHZ. 2019-12-09T09:17:26.33 0.1 positive manual P 105 0.4011 50 -0.37 90
IV.ASQU.HHZ. 2019-12-09T09:17:26.45 0.1 positive manual P 122 0.4065 50 -0.34 90
IV.MPPT.EHZ. 2019-12-09T09:17:25.00 0.3 undecidable manual S 251 0.1664 112 0.17 73
IV.FNVD.HHZ. 2019-12-09T09:17:25.93 0.1 undecidable manual S 320 0.2059 108 -0.34 94
IV.MTRZ.HHZ. 2019-12-09T09:17:25.54 0.1 positive manual P 15 0.313 102 0.49 89
IV.LMD.HHZ. 2019-12-09T09:17:24.31 0.1 positive manual P 77 0.2941 103 -0.32 92
IV.CRMI.HHZ. 2019-12-09T09:17:24.92 0.1 undecidable manual P 228 0.3202 102 -0.29 93
IV.FIR.HHZ. 2019-12-09T09:17:23.91 0.1 negative manual P 189 0.2401 105 0.44 91
IV.FNVD.HHZ. 2019-12-09T09:17:22.72 0.1 negative manual P 320 0.2059 108 -0.03 100
IV.MOCL.EHZ. 2019-12-09T09:17:22.49 0.3 undecidable manual S 266 0.0926 126 0.17 74
IT.FIE.HGZ. 2019-12-09T09:17:22.97 0.1 negative manual P 183 0.2041 108 0.26 95
IV.MPPT.EHZ. 2019-12-09T09:17:22.21 0.1 positive manual P 251 0.1664 112 0.3 95
IV.MOCL.EHZ. 2019-12-09T09:17:20.80 0.1 undecidable manual P 266 0.0926 126 0.34 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOCL.EHN. ML:3.8 0.1025 0.48 AML other m 2019-12-09T09:17:22.65
IV.MOCL.EHE. ML:3.6 0.05815 0.12 AML other m 2019-12-09T09:17:22.64
IV.MPPT.EHE. ML:3.6 0.03025 1.48 AML other m 2019-12-09T09:17:25.14
IV.MPPT.EHN. ML:3.5 0.0287 0.22 AML other m 2019-12-09T09:17:25.80
IV.FNVD.HHN. ML:3.9 0.04925 0.4 AML other m 2019-12-09T09:17:27.80
IV.FNVD.HHE. ML:3.6 0.0302 1.5 AML other m 2019-12-09T09:17:27.98
IV.LMD.HHN. ML:3.4 0.011 0.64 AML other m 2019-12-09T09:17:29.60
IV.FIR.HHE. ML:3.5 0.0172 0.58 AML other m 2019-12-09T09:17:29.96
IV.FIR.HNE. ML:3.5 0.01735 0.6 AML other m 2019-12-09T09:17:29.97
IV.LMD.HHE. ML:3.3 0.00921 0.5 AML other m 2019-12-09T09:17:31.39
IV.FIR.HHN. ML:3.6 0.0207 1.38 AML other m 2019-12-09T09:17:32.06
IV.FIR.HNN. ML:3.6 0.02035 1.38 AML other m 2019-12-09T09:17:32.06
GU.POPM.HHE. ML:3.5 0.010545 0.46 AML other m 2019-12-09T09:17:33.42
GU.POPM.HHN. ML:3.6 0.01265 1.08 AML other m 2019-12-09T09:17:33.23
IV.SFI.HNE. ML:2.9 0.002665 0.24 AML other m 2019-12-09T09:17:33.85
IV.SFI.EHE. ML:2.9 0.002675 0.26 AML other m 2019-12-09T09:17:33.86
IV.SFI.HNN. ML:2.9 0.002685 1.6 AML other m 2019-12-09T09:17:33.87
IV.SFI.EHN. ML:2.9 0.00266 1.62 AML other m 2019-12-09T09:17:33.88
IV.BRIS.HHN. ML:3.5 0.0111 0.32 AML other m 2019-12-09T09:17:34.25
IV.MTRZ.HHE. ML:3.3 0.008415 0.28 AML other m 2019-12-09T09:17:35.05
IV.MTRZ.HNE. ML:3.3 0.0081 0.3 AML other m 2019-12-09T09:17:35.05
IV.MTRZ.HNN. ML:3.4 0.009535 0.38 AML other m 2019-12-09T09:17:35.59
IV.MTRZ.HHN. ML:3.4 0.00966 0.38 AML other m 2019-12-09T09:17:35.59
IV.ASQU.HHE. ML:3 0.00292 1.1 AML other m 2019-12-09T09:17:36.03
IV.BDI.HHE. ML:3.6 0.008325 0.26 AML other m 2019-12-09T09:17:37.23
IV.BDI.HHN. ML:3.6 0.00931 1.42 AML other m 2019-12-09T09:17:37.99
IV.BDI.HNN. ML:3.6 0.00958 0.56 AML other m 2019-12-09T09:17:37.00
IV.OSSC.HNE. ML:3.3 0.004845 0.22 AML other m 2019-12-09T09:17:37.32
IV.OSSC.HHN. ML:3.3 0.004875 0.22 AML other m 2019-12-09T09:17:37.32
IV.OSSC.HHE. ML:3.2 0.003755 0.78 AML other m 2019-12-09T09:17:37.36
IV.OSSC.HNN. ML:3.2 0.00371 0.76 AML other m 2019-12-09T09:17:37.36
IV.ZCCA.HHE. ML:3 0.002695 0.44 AML other m 2019-12-09T09:17:38.47
IV.ZCCA.HNE. ML:2.9 0.00257 0.46 AML other m 2019-12-09T09:17:38.47
IV.ZCCA.HHN. ML:3.1 0.00401 1.58 AML other m 2019-12-09T09:17:38.95
IV.ZCCA.HNN. ML:3.1 0.00383 1.56 AML other m 2019-12-09T09:17:38.95
IV.BDI.HNE. ML:3.5 0.00741 0.36 AML other m 2019-12-09T09:17:38.96
GU.CARD.HHN. ML:3.5 0.005675 0.52 AML other m 2019-12-09T09:17:39.00
GU.CARD.HHE. ML:3.2 0.00313 1.28 AML other m 2019-12-09T09:17:39.94
IV.ASQU.HHN. ML:3 0.00292 0.62 AML other m 2019-12-09T09:17:40.55
IV.CSNT.HHE. ML:3.2 0.00313 0.38 AML other m 2019-12-09T09:17:40.46
GU.GSCL.HHN. ML:3.2 0.00304 1.2 AML other m 2019-12-09T09:17:41.92
IV.CSNT.HHN. ML:3.4 0.00492 0.64 AML other m 2019-12-09T09:17:41.44
IV.BRIS.HHE. ML:3.4 0.008665 1.48 AML other m 2019-12-09T09:17:41.81
IV.PII.HHE. ML:3.7 0.00858 1.64 AML other m 2019-12-09T09:17:42.92
IV.TRIF.CHE. ML:2.8 0.000645 0.7 AML other m 2019-12-09T09:17:42.19
IV.PII.HHN. ML:3.7 0.009405 0.3 AML other m 2019-12-09T09:17:43.35
MN.VLC.HHN. ML:3.2 0.00215 1.32 AML other m 2019-12-09T09:17:43.74
MN.VLC.HNN. ML:3.2 0.002185 1.34 AML other m 2019-12-09T09:17:43.75
IV.CRE.HHE. ML:3.1 0.002475 1.08 AML other m 2019-12-09T09:17:44.09
MN.VLC.HHE. ML:3.1 0.00196 0.64 AML other m 2019-12-09T09:17:44.38
MN.VLC.HNE. ML:3.1 0.001925 0.62 AML other m 2019-12-09T09:17:44.39
IV.CRE.HHN. ML:3.2 0.002605 0.38 AML other m 2019-12-09T09:17:45.05
GU.GSCL.HHE. ML:3.2 0.00293 0.86 AML other m 2019-12-09T09:17:45.91
IV.FROS.CHN. ML:3.2 0.00187 0.4 AML other m 2019-12-09T09:17:50.70
IV.FROS.CHE. ML:3.2 0.00188 0.88 AML other m 2019-12-09T09:17:50.16
IV.MAGO.CHE. ML:2.9 0.000877 0.44 AML other m 2019-12-09T09:17:52.62
IV.MAGO.CHN. ML:2.9 0.00085 1.18 AML other m 2019-12-09T09:17:52.06
GU.GRAM.HHN. ML:3.4 0.002145 0.38 AML other m 2019-12-09T09:17:54.81
GU.GRAM.HHE. ML:3.6 0.003735 1.04 AML other m 2019-12-09T09:17:55.16
IV.TRIF.CHN. ML:2.8 0.000586 0.48 AML other m 2019-12-09T09:17:55.50
IV.CPGN.HNE. ML:2.8 0.000942 1.12 AML other m 2019-12-09T09:17:57.21
IV.CPGN.EHE. ML:2.9 0.0009715 0.54 AML other m 2019-12-09T09:17:58.66
IV.CPGN.HNN. ML:2.9 0.00114 0.7 AML other m 2019-12-09T09:17:58.38
IV.CPGN.EHN. ML:2.9 0.001076 1.02 AML other m 2019-12-09T09:17:58.81
IV.ATPI.EHN. ML:2.9 0.000648 0.5 AML other m 2019-12-09T09:17:59.65
IV.ATPI.EHE. ML:2.8 0.0005335 0.62 AML other m 2019-12-09T09:18:06.47
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Focal Mechanisms

Focal Mechanisms

This map reports the focal mechanisms since 1977 in the region. The white and red beach ball symbols are mechanisms determined using the Regional Centroid Moment Tensor (RCMT, and are determined for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when there is a good source-receiver geometry of the target earthquake, the RCMT can be obtained also for earthquakes with magnitude larger than 4.0. The blue and white beach ball symbols indicate the mechanisms obtained from application of the Time Domain Moment Tensor (TDMT, This technique is used for M ≥ 3.5. The size of the beach ball sysmbol scales with the calculated moment magnitude, Mw.
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download
Waveforms Seismic signals in full SEED format Download