INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of 2.0 on date 17-02-2017 and time 10:46:30 (UTC) in region Firenze

A magnitude ML 2.0 earthquake occured in the Firenze region on

  • 17-02-2017 10:46:30 (UTC)
  • 17-02-2017 11:46:30 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.63, 10.99 at 12 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 2011).
Municipality Region Dist Inh Cum Inh
Castelfiorentino FI 3 17489 17489
Montespertoli FI 7 13195 30684
Certaldo FI 10 15935 46619
Empoli FI 11 46541 93160
Gambassi Terme FI 11 4900 98060
Montaione FI 11 3776 101836
Montelupo Fiorentino FI 11 13653 115489
San Miniato PI 12 27585 143074
Capraia e Limite FI 13 7298 150372
San Casciano in Val di Pesa FI 16 16883 167255
Tavarnelle Val di Pesa FI 17 7675 174930
Cerreto Guidi FI 17 10364 185294
Palaia PI 18 4572 189866
Barberino Val d'Elsa FI 18 4351 194217
Fucecchio FI 18 22785 217002
Vinci FI 18 14105 231107
Lastra a Signa FI 18 18960 250067
San Gimignano SI 19 7677 257744
Montopoli in Val d'Arno PI 19 11167 268911
Signa FI 19 17451 286362
Santa Croce sull'Arno PI 19 14061 300423

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km SW of Firenze (358079 inhabitants)
29 Km SW of Prato (185456 inhabitants)
34 Km S of Pistoia (89101 inhabitants)
44 Km NW of Siena (52839 inhabitants)
46 Km SE of Lucca (87200 inhabitants)
48 Km E of Pisa (85858 inhabitants)
56 Km E of Livorno (157052 inhabitants)
65 Km E of Viareggio (61857 inhabitants)
74 Km W of Arezzo (98144 inhabitants)
82 Km SE of Massa (68856 inhabitants)
87 Km SE of Carrara (64689 inhabitants)
97 Km N of Grosseto (78630 inhabitants)
99 Km SW of Imola (67892 inhabitants)
100 Km S of Bologna (371337 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.
Significant earthquakes since 1000 AD until 2006

Significant earthquakes since 1000 AD until 2006

This map shows the epicenters of the historical earthquakes catalogue CPT11 (Catalogo Parametrico dei Terremoti Italiani, 2011 version) with estimated magnitude ≥ 5.0 since 1000 AD until 2006. 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 (http://zonesismiche.mi.ingv.it) 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.
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 Date and Time (UTC) Latitude Longitude Magnitude Depth (km) Published time (UTC) Author Location ID
Rev 100 2017-02-17
10:46:30
43.63 10.99 ML 2.0 13 2017-02-17
10:56:22
Sala Sismica INGV-Roma 41206961
Best location and best magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2017-02-17 10:46:30 ± 0.09
Latitude 43.63 ± 0.01
Longitude 10.99 ± 0.01
Depth (km) 13 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 41206961

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 680
Semi-minor axis of confidence ellipse (meter) 104
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 55
Circular confidence region, given by single value of horizontal uncertainty (meter) 680
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 98
Number of associated phases, regardless of their use for origin computation 70
Number of defining phases 43
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.45
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 1.26175
Number of stations at which the event was observed 54
Number of stations from which data was used for origin computation 28
Magnitude information

ML:2

Field Value
Value 2
Uncertainty 0.3
Num. used stations 22
Type of magnitude ML
Reference to an origin 41206961
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2017-02-17 10:56:22
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.PALZ.HHZ. 2017-02-17T10:48:10.95 3.0 undecidable manual Sn -6.68 0
IV.SPS2.HHZ. 2017-02-17T10:48:02.92 3.0 negative manual Pg 15.56 0
IV.IVPL.HHZ. 2017-02-17T10:47:55.18 3.0 undecidable manual Pn 3.21 0
IV.ISTR.HHZ. 2017-02-17T10:47:51.47 3.0 undecidable manual Pn 3.86 0
IV.ILLI.HHZ. 2017-02-17T10:47:48.14 3.0 positive manual Pn -2.8 0
IV.VBKN.HHZ. 2017-02-17T10:47:36.12 3.0 positive manual Pg 17.27 0
IV.MRB1.HHZ. 2017-02-17T10:47:33.19 3.0 undecidable manual Pg 14.77 0
IV.VIVA.HHZ. 2017-02-17T10:47:25.07 3.0 undecidable manual Sn -5.98 0
SL.KOGS.BHZ. 2017-02-17T10:47:24.07 3.0 undecidable manual Pn 6.17 0
IV.SACR.HHZ. 2017-02-17T10:47:18.74 3.0 undecidable manual Pn 4.97 0
IV.BRMO.HHZ. 2017-02-17T10:47:12.70 3.0 undecidable manual Pg 13.19 0
IV.MONC.HHZ. 2017-02-17T10:47:12.29 3.0 positive manual Pg 6.71 0
GU.BHB.HHZ. 2017-02-17T10:47:10.69 3.0 undecidable manual Pn -0.53 0
GU.GRAM.HHZ. 2017-02-17T10:47:10.02 3.0 undecidable manual Sg 9.57 0
IV.SENI.HNZ. 2017-02-17T10:47:07.57 3.0 undecidable manual Sg 11.43 0
IV.MMO1.EHZ. 2017-02-17T10:46:50.58 3.0 undecidable manual Pn 1.7 0
IV.ATPI.EHZ. 2017-02-17T10:46:49.96 0.1 undecidable manual P 99 1.0387 91 0.46 79
IV.PARC.HHZ. 2017-02-17T10:46:47.95 0.1 undecidable manual P 88 0.9038 91 0.77 73
MN.TRI.BHZ. 2017-02-17T10:46:57.66 3.0 undecidable manual Pn 4.53 0
IV.LMD.HHZ. 2017-02-17T10:46:43.65 0.1 undecidable manual P 49 0.6835 91 0.23 91
IV.MSSA.HHZ. 2017-02-17T10:46:53.78 0.1 undecidable manual P 303 1.2617 91 0.48 77
IV.RMP.HHZ. 2017-02-17T10:46:52.71 3.0 negative manual Pn -6.91 0
IV.CNCS.HNZ. 2017-02-17T10:46:52.06 3.0 positive manual Pn 1.83 0
IV.CRE.HHZ. 2017-02-17T10:46:43.87 0.3 undecidable manual P 91 0.6961 91 0.24 67
IV.ASQU.HHZ. 2017-02-17T10:46:42.19 0.1 undecidable manual P 74 0.6016 91 0.18 93
IV.SBPO.HNZ. 2017-02-17T10:46:50.61 3.0 undecidable manual Sn -3.91 0
IV.SACS.HHZ. 2017-02-17T10:46:50.03 0.1 undecidable manual P 139 1.0288 91 0.71 73
IV.ATVO.HHZ. 2017-02-17T10:46:50.51 0.1 undecidable manual P 103 1.0567 91 0.71 72
IV.MCIV.HHZ. 2017-02-17T10:46:49.19 0.1 undecidable manual P 149 0.9875 91 0.58 78
TV.SF04.EHZ. 2017-02-17T10:46:48.21 0.1 positive manual P 148 0.9326 91 0.54 80
IV.VOBA.HNZ. 2017-02-17T10:46:48.46 3.0 undecidable manual Pn -0.49 0
IV.SEI.HHZ. 2017-02-17T10:46:40.48 0.3 undecidable manual P 32 0.5009 92 0.19 71
IV.TRIF.HHZ. 2017-02-17T10:46:40.57 0.1 undecidable manual P 187 0.5189 92 -0.03 97
TV.SF01.EHZ. 2017-02-17T10:46:47.89 0.1 undecidable manual P 153 0.9182 91 0.46 82
IV.CASP.HHZ. 2017-02-17T10:46:46.88 0.6 positive manual P 186 0.8436 91 0.72 39
GU.EQUI.HHZ. 2017-02-17T10:46:46.02 0.1 undecidable manual P 312 0.8058 91 0.51 84
IV.SSP9.EHZ. 2017-02-17T10:46:46.98 3.0 undecidable manual Sn 1.52 0
IV.LEOD.HNZ. 2017-02-17T10:46:45.13 3.0 undecidable manual Pn -4.23 0
GU.MAIM.HHZ. 2017-02-17T10:46:39.75 0.1 undecidable manual P 308 0.4578 92 0.19 97
IV.CAFI.HHZ. 2017-02-17T10:46:45.06 0.3 undecidable manual P 113 0.7698 91 0.17 67
IV.RUFI.EHZ. 2017-02-17T10:46:38.92 0.1 undecidable manual P 61 0.429 92 -0.15 97
IV.FROS.HHZ. 2017-02-17T10:46:38.95 0.1 undecidable manual P 164 0.4371 92 -0.26 94
GU.SARM.EHZ. 2017-02-17T10:46:44.03 0.1 undecidable manual P 323 0.697 91 0.38 89
IV.MOCL.EHZ. 2017-02-17T10:46:38.32 0.1 undecidable manual P 20 0.3993 93 -0.24 96
MN.VLC.HHZ. 2017-02-17T10:46:43.91 0.1 undecidable manual P 321 0.6844 91 0.48 87
IV.CSP1.EHZ. 2017-02-17T10:46:43.91 3.0 undecidable manual Pn -2.16 0
IV.PII.HHZ. 2017-02-17T10:46:37.85 0.1 negative manual P 285 0.348 93 0.17 100
IV.MPPT.EHE. 2017-02-17T10:46:37.28 0.1 undecidable manual P 12 0.3354 93 -0.18 98
IV.BDI.HHZ. 2017-02-17T10:46:40.82 0.1 undecidable manual P 327 0.5171 92 0.24 95
IV.CSNT.HHZ. 2017-02-17T10:46:35.70 0.1 undecidable manual P 126 0.268 95 -0.62 89
IV.NDIM.HHZ. 2017-02-17T10:46:39.01 3.0 negative manual Pn 0.42 0
IV.CRMI.HHN. 2017-02-17T10:46:34.35 0.1 positive manual P 358 0.1655 103 -0.23 100
IV.APEC.HHZ. 2017-02-17T10:46:37.50 3.0 negative manual P 1.14 0
IV.OSSC.HNZ. 2017-02-17T10:46:34.90 0.1 undecidable manual P 120 0.214 97 -0.5 94
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.APEC.HHN. ML:2 7.63E-5 0.26 AML other m 2017-02-17T10:47:07.61
IV.APEC.HHE. ML:2.1 0.0001107 0.9 AML other m 2017-02-17T10:47:07.84
IV.ASQU.HHE. ML:2.1 0.000224 0.2 AML other m 2017-02-17T10:46:52.18
IV.ASQU.HHN. ML:2.1 0.000227 0.64 AML other m 2017-02-17T10:46:52.51
IV.ATPI.EHE. ML:1.6 2.885E-5 0.58 AML other m 2017-02-17T10:47:12.32
IV.ATPI.EHN. ML:1.5 2.705E-5 1.6 AML other m 2017-02-17T10:47:12.18
IV.ATVO.HHE. ML:1.8 4.545E-5 1.64 AML other m 2017-02-17T10:47:09.13
IV.ATVO.HHN. ML:1.6 2.87E-5 1.54 AML other m 2017-02-17T10:47:10.11
IV.BDI.HHE. ML:1.6 8.575E-5 0.82 AML other m 2017-02-17T10:46:53.75
IV.BDI.HHN. ML:1.5 7.07E-5 0.38 AML other m 2017-02-17T10:46:53.92
IV.CASP.HHE. ML:2.1 0.0001335 0.48 AML other m 2017-02-17T10:47:00.65
IV.CASP.HHN. ML:1.9 8.74E-5 0.48 AML other m 2017-02-17T10:47:01.61
IV.CRE.HHE. ML:1.8 9.215E-5 0.42 AML other m 2017-02-17T10:46:55.11
IV.CRE.HHN. ML:1.8 9.02E-5 0.24 AML other m 2017-02-17T10:46:59.13
IV.CSNT.HHN. ML:2 0.0004655 0.6 AML other m 2017-02-17T10:46:40.41
IV.CSNT.HHE. ML:1.9 0.0003845 1 AML other m 2017-02-17T10:46:41.60
GU.EQUI.HHN. ML:1.9 9.575E-5 0.94 AML other m 2017-02-17T10:47:01.48
GU.EQUI.HHE. ML:1.8 6.465E-5 0.44 AML other m 2017-02-17T10:46:47.60
IV.FROS.HHE. ML:2.6 0.0011185 0.38 AML other m 2017-02-17T10:46:45.18
IV.FROS.HHN. ML:2.4 0.000734 0.5 AML other m 2017-02-17T10:46:46.56
GU.MAIM.HHN. ML:1.8 0.0001725 1.82 AML other m 2017-02-17T10:46:47.91
GU.MAIM.HHE. ML:1.7 0.0001195 0.5 AML other m 2017-02-17T10:46:46.29
IV.MCIV.HHE. ML:1.6 2.78E-5 0.18 AML other m 2017-02-17T10:47:01.24
IV.MCIV.HHN. ML:1.5 2.545E-5 1.18 AML other m 2017-02-17T10:47:26.03
IV.MOCL.EHE. ML:2 0.000305 0.2 AML other m 2017-02-17T10:46:46.60
IV.MOCL.EHN. ML:2 0.000313 0.28 AML other m 2017-02-17T10:46:46.11
IV.OSSC.HNE. ML:2 0.000673 1.42 AML other m 2017-02-17T10:46:40.01
IV.OSSC.HNN. ML:2 0.000654 0.42 AML other m 2017-02-17T10:46:40.39
IV.OSSC.HHE. ML:2 0.0005825 0.24 AML other m 2017-02-17T10:46:38.69
IV.OSSC.HHN. ML:2.1 0.0007085 1.44 AML other m 2017-02-17T10:46:40.00
IV.PARC.HHE. ML:1.6 3.795E-5 0.98 AML other m 2017-02-17T10:47:03.79
IV.PARC.HHN. ML:1.8 5.805E-5 0.9 AML other m 2017-02-17T10:47:03.07
IV.PII.HHE. ML:2.5 0.001201 0.16 AML other m 2017-02-17T10:46:42.82
IV.PII.HHN. ML:2.6 0.00139 1.2 AML other m 2017-02-17T10:46:43.82
IV.RUFI.EHN. ML:1.9 0.000198 0.38 AML other m 2017-02-17T10:46:46.76
IV.RUFI.EHE. ML:2 0.000296 0.78 AML other m 2017-02-17T10:46:46.19
IV.SACS.HNE. ML:2.8 0.000592 0.42 AML other m 2017-02-17T10:47:13.72
IV.SACS.HNN. ML:3 0.000774 1.58 AML other m 2017-02-17T10:47:10.20
GU.SARM.EHE. ML:2.2 0.0002495 0.62 AML other m 2017-02-17T10:46:56.27
GU.SARM.EHN. ML:2.5 0.0004335 0.52 AML other m 2017-02-17T10:46:56.82
IV.SEI.HHE. ML:2 0.000233 0.38 AML other m 2017-02-17T10:46:51.80
IV.SEI.HHN. ML:2.3 0.000428 0.84 AML other m 2017-02-17T10:46:50.52
TV.SF04.EHN. ML:2.2 0.000145 0.22 AML other m 2017-02-17T10:47:05.34
TV.SF04.EHE. ML:2.2 0.0001455 0.22 AML other m 2017-02-17T10:46:48.73
IV.TRIF.HHE. ML:2.3 0.0004025 0.52 AML other m 2017-02-17T10:46:48.67
IV.TRIF.HHN. ML:2.2 0.0003775 0.62 AML other m 2017-02-17T10:46:49.43
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, http://www.bo.ingv.it/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, http://cnt.rm.ingv.it/tdmt.html). This technique is used for M ≥ 3.5. The size of the beach ball sysmbol scales with the calculated moment magnitude, Mw.
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 full SEED format Download