Earthquake with magnitude of ML 0.9 on date 23-01-2020 and time 06:15:46 (Italy) in region 5 km N Castelfiorentino (FI)

A magnitude ML 0.9 earthquake occured in region: 5 km N Castelfiorentino (FI), on

  • 23-01-2020 05:15:46 (UTC)
  • 23-01-2020 06:15:46 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.65, 10.97 at 10 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
Castelfiorentino FI 5 17504 17504
Empoli FI 8 48109 65613
Montespertoli FI 9 13537 79150
San Miniato PI 10 27934 107084
Montelupo Fiorentino FI 10 14098 121182
Capraia e Limite FI 10 7670 128852
Montaione FI 12 3700 132552
Gambassi Terme FI 12 4870 137422
Certaldo FI 13 16121 153543
Cerreto Guidi FI 14 10870 164413
Fucecchio FI 15 23618 188031
Vinci FI 16 14604 202635
Palaia PI 16 4612 207247
Santa Croce sull'Arno PI 17 14601 221848
Montopoli in Val d'Arno PI 17 11148 232996
Lastra a Signa FI 17 20156 253152
San Casciano in Val di Pesa FI 18 17062 270214
Signa FI 18 19179 289393
Castelfranco di Sotto PI 19 13427 302820
Carmignano PO 19 14450 317270
Tavarnelle Val di Pesa FI 19 7800 325070
Lamporecchio PT 19 7508 332578
Poggio a Caiano PO 20 10007 342585

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km SW of Scandicci (50609 inhabitants)
27 Km W of Firenze (382808 inhabitants)
28 Km SW of Prato (191150 inhabitants)
32 Km S of Pistoia (90315 inhabitants)
43 Km SE of Lucca (89046 inhabitants)
46 Km E of Pisa (89158 inhabitants)
47 Km NW of Siena (53903 inhabitants)
54 Km E of Livorno (159219 inhabitants)
62 Km E of Viareggio (62467 inhabitants)
77 Km W of Arezzo (99543 inhabitants)
79 Km SE of Massa (69479 inhabitants)
84 Km SE of Carrara (63133 inhabitants)
98 Km SW of Imola (69797 inhabitants)
99 Km SW of Bologna (386663 inhabitants)
100 Km N of Grosseto (82087 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 2020-01-23
05:15:46
43.65 10.97 10 2020-01-23
05:48:41
Sala Sismica INGV-Roma 75760611
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-01-23 05:15:46 ± 0.18
Latitude 43.65 ± 0.01
Longitude 10.97 ± 0.01
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 75760611

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 798
Semi-minor axis of confidence ellipse (meter) 621
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 24
Circular confidence region, given by single value of horizontal uncertainty (meter) 800
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 156
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) 0.21
Epicentral distance of station closest to the epicenter (degree) 0.14479
Epicentral distance of station farthest from the epicenter (degree) 0.32825
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 75760611
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-01-23 05:48:41
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MPPT.EHZ. 2020-01-23T05:15:58.27 0.6 undecidable manual S 16 0.3193 50 0.08 53
IV.CSNT.HHZ. 2020-01-23T05:15:57.23 0.3 undecidable manual S 127 0.2932 50 -0.2 78
IV.PII.HHZ. 2020-01-23T05:15:57.93 0.6 undecidable manual S 283 0.3283 50 -0.52 48
IV.OSSC.HHZ. 2020-01-23T05:15:55.87 0.6 undecidable manual S 122 0.2383 50 0.08 54
IV.MPPT.EHZ. 2020-01-23T05:15:53.14 0.6 negative manual P 16 0.3193 50 0.09 53
IV.PII.HHZ. 2020-01-23T05:15:53.53 0.1 negative manual P 283 0.3283 50 0.33 100
IV.CSNT.HHZ. 2020-01-23T05:15:52.63 0.6 positive manual P 127 0.2932 50 0.02 54
IV.CRMI.HHZ. 2020-01-23T05:15:52.36 0.6 undecidable manual S 3 0.1448 122 -0.24 53
IV.OSSC.HHZ. 2020-01-23T05:15:51.69 0.6 negative manual P 122 0.2383 50 0.03 54
IV.CRMI.HHZ. 2020-01-23T05:15:49.96 1.0 positive manual P 3 0.1448 122 0.14 27
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CRMI.HHN. ML:0.6 4.1E-5 0.46 AML other m 2020-01-23T05:15:52.86
IV.CRMI.HHE. ML:0.5 3.175E-5 0.7 AML other m 2020-01-23T05:15:52.46
IV.CRMI.HNE. ML:0.9 6.67E-5 0.16 AML other m 2020-01-23T05:15:52.73
IV.CRMI.HNN. ML:1 9.615E-5 0.16 AML other m 2020-01-23T05:15:52.86
IV.PII.HHE. ML:1.2 6.275E-5 0.5 AML other m 2020-01-23T05:15:58.47
IV.PII.HHN. ML:1.3 8.13E-5 1.06 AML other m 2020-01-23T05:15:58.11
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