Earthquake with magnitude of ML 0.9 on date 20-04-2019 and time 13:38:17 (Italy) in region 4 km S Montelupo Fiorentino (FI)

A magnitude ML 0.9 earthquake occured in region: 4 km S Montelupo Fiorentino (FI), on

  • 20-04-2019 11:38:17 (UTC)
  • 20-04-2019 13:38:17 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.69, 11.02 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).
Municipality Region Dist Inh Cum Inh
Montelupo Fiorentino FI 4 14098 14098
Capraia e Limite FI 7 7670 21768
Empoli FI 7 48109 69877
Montespertoli FI 7 13537 83414
Castelfiorentino FI 11 17504 100918
Lastra a Signa FI 11 20156 121074
Signa FI 12 19179 140253
Vinci FI 13 14604 154857
Carmignano PO 13 14450 169307
San Casciano in Val di Pesa FI 14 17062 186369
San Miniato PI 14 27934 214303
Cerreto Guidi FI 14 10870 225173
Poggio a Caiano PO 14 10007 235180
Scandicci FI 15 50609 285789
Certaldo FI 16 16121 301910
Campi Bisenzio FI 17 46166 348076
Lamporecchio PT 17 7508 355584
Quarrata PT 18 26190 381774
Fucecchio FI 18 23618 405392
Montaione FI 18 3700 409092
Gambassi Terme FI 18 4870 413962
Impruneta FI 19 14615 428577
Larciano PT 19 6394 434971
Tavarnelle Val di Pesa FI 19 7800 442771
Santa Croce sull'Arno PI 20 14601 457372

Municipalities with at least 50000 inhabitants

An earthquake occurred to
15 Km W of Scandicci (50609 inhabitants)
21 Km W of Firenze (382808 inhabitants)
22 Km S of Prato (191150 inhabitants)
28 Km SE of Pistoia (90315 inhabitants)
45 Km E of Lucca (89046 inhabitants)
49 Km NW of Siena (53903 inhabitants)
50 Km E of Pisa (89158 inhabitants)
60 Km E of Livorno (159219 inhabitants)
65 Km E of Viareggio (62467 inhabitants)
74 Km W of Arezzo (99543 inhabitants)
80 Km E of Massa (69479 inhabitants)
86 Km SE of Carrara (63133 inhabitants)
92 Km SW of Imola (69797 inhabitants)
93 Km S of Bologna (386663 inhabitants)
95 Km SW of Faenza (58541 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 0.9 2019-04-20
11:38:17
43.69 11.02 12 2019-04-20
11:44:39
Sala Sismica INGV-Roma 67778981
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2019-04-20 11:38:17 ± 0.13
Latitude 43.69 ± 0.01
Longitude 11.02 ± 0.01
Depth (km) 12 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 67778981

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1198
Semi-minor axis of confidence ellipse (meter) 528
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 52
Circular confidence region, given by single value of horizontal uncertainty (meter) 1200
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 136
Number of associated phases, regardless of their use for origin computation 29
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.34
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.36153
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 6
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.8
Num. used stations 10
Type of magnitude ML
Reference to an origin 67778981
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2019-04-20 11:44:39
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.EPZF.HHZ. 2019-04-20T11:40:10.43 3.0 undecidable manual Pg 16.76 0
CR.ZAG.BHZ. 2019-04-20T11:40:09.92 3.0 undecidable manual Sn 3.23 0
IV.GRI.EHZ. 2019-04-20T11:40:07.04 3.0 negative manual Pg 16.34 0
IV.PTRJ.HNZ. 2019-04-20T11:40:03.73 3.0 undecidable manual Sg 10.82 0
GU.RRL.HHZ. 2019-04-20T11:39:59.48 3.0 undecidable manual Sg 12.23 0
IT.VNF1.HGZ. 2019-04-20T11:39:51.33 3.0 undecidable manual Sg 6.6 0
IV.SLCN.HHZ. 2019-04-20T11:39:43.80 3.0 undecidable manual Pg 14.9 0
IV.CAFE.HHZ. 2019-04-20T11:39:29.32 3.0 undecidable manual Pg 9.52 0
GU.CANO.HHZ. 2019-04-20T11:39:24.77 3.0 undecidable manual Sg 6.58 0
IV.MTMR.EHZ. 2019-04-20T11:39:22.26 3.0 undecidable manual Pn 3.16 0
IV.ARRO.EHZ. 2019-04-20T11:39:12.62 3.0 undecidable manual Sg 3.44 0
IV.ARVD.HHZ. 2019-04-20T11:39:01.06 3.0 undecidable manual S -0.14 0
IV.IMI.HHZ. 2019-04-20T11:38:57.21 3.0 undecidable manual Pn 2.53 0
IV.VENL.HNZ. 2019-04-20T11:38:56.68 3.0 negative manual Pg 7.39 0
IV.LAV9.HHZ. 2019-04-20T11:38:55.96 3.0 positive manual Pn -0.22 0
IV.NDIM.HNZ. 2019-04-20T11:38:53.31 3.0 undecidable manual S -1.57 0
IV.PII.HHZ. 2019-04-20T11:38:30.76 0.1 undecidable manual S 275 0.3615 91 -0.35 91
IV.CSNT.HHZ. 2019-04-20T11:38:29.15 0.1 undecidable manual S 139 0.2932 92 0.06 98
IV.BDI.HHZ. 2019-04-20T11:38:28.45 3.0 undecidable manual P 0.9 0
IV.MPPT.EHZ. 2019-04-20T11:38:28.20 0.1 undecidable manual S 10 0.268 92 -0.13 97
IV.OSSC.HHZ. 2019-04-20T11:38:26.82 0.1 undecidable manual S 137 0.2338 93 -0.52 89
IV.PII.HHZ. 2019-04-20T11:38:26.22 0.3 positive manual P 275 0.3615 91 0.67 62
IV.MOCL.EHZ. 2019-04-20T11:38:25.16 1.0 positive manual P 20 0.331 91 0.14 24
IV.MPPT.EHZ. 2019-04-20T11:38:24.06 0.1 positive manual P 10 0.268 92 0.12 97
IV.CSNT.HHZ. 2019-04-20T11:38:24.51 0.1 positive manual P 139 0.2932 92 0.14 97
IV.OSSC.HHZ. 2019-04-20T11:38:23.78 0.6 positive manual P 137 0.2338 93 0.41 46
IV.CRMI.HHZ. 2019-04-20T11:38:23.43 0.1 undecidable manual S 342 0.1061 116 -0.19 100
IV.CRMI.HHZ. 2019-04-20T11:38:21.45 0.3 undecidable manual P 342 0.1061 116 0.23 73
IV.FIR.HHZ. 2019-04-20T11:38:20.64 3.0 undecidable manual P -1.67 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CRMI.HHN. ML:0.5 2.855E-5 0.32 AML other m 2019-04-20T11:38:23.46
IV.CRMI.HHE. ML:0.4 2.56E-5 0.24 AML other m 2019-04-20T11:38:23.67
IV.CSNT.HHN. ML:0.7 2.13E-5 0.48 AML other m 2019-04-20T11:38:29.61
IV.CSNT.HHE. ML:0.7 1.935E-5 0.68 AML other m 2019-04-20T11:38:31.62
IV.MOCL.EHE. ML:0.7 2.205E-5 1.4 AML other m 2019-04-20T11:38:32.15
IV.MOCL.EHN. ML:0.7 1.896E-5 1.4 AML other m 2019-04-20T11:38:34.17
IV.NDIM.HHN. ML:3.1 0.000839 0.1 AML other m 2019-04-20T11:38:58.66
IV.NDIM.HHE. ML:2.9 0.000534 0.06 AML other m 2019-04-20T11:38:58.69
IV.IMI.HHN. ML:3.3 0.0004075 1.06 AML other m 2019-04-20T11:38:58.41
IV.IMI.HHE. ML:3.1 0.00021845 0.56 AML other m 2019-04-20T11:39:01.90
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