Earthquake 1 km SE Castelfiorentino (FI), Magnitude ML 1.4, 5 December 2020 time 19:08:22 (Timezone Italy)

A magnitude ML 1.4 earthquake occured in region: 1 km SE Castelfiorentino (FI), on

05-12-2020 18:08:22 (UTC)
05-12-2020 19:08:22 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.6, 10.99 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.

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Display location by

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).

Municipality	Region	Distance (km)	Inhabitants	Cumulative Inhabitants
Castelfiorentino	FI	1	17504	17504
Certaldo	FI	7	16121	33625
Gambassi Terme	FI	7	4870	38495
Montaione	FI	8	3700	42195
Montespertoli	FI	9	13537	55732
Empoli	FI	14	48109	103841
San Miniato	PI	14	27934	131775
Montelupo Fiorentino	FI	15	14098	145873
San Gimignano	SI	15	7820	153693
Tavarnelle Val di Pesa	FI	16	7800	161493
Capraia e Limite	FI	16	7670	169163
Barberino Val d'Elsa	FI	16	4386	173549
San Casciano in Val di Pesa	FI	17	17062	190611
Palaia	PI	17	4612	195223
Poggibonsi	SI	20	29196	224419
Montopoli in Val d'Arno	PI	20	11148	235567
Cerreto Guidi	FI	20	10870	246437

Municipalities with at least 50000 inhabitants

An earthquake occurred to

24 Km SW of Scandicci (50609 inhabitants)

29 Km SW of Firenze (382808 inhabitants)

33 Km S of Prato (191150 inhabitants)

38 Km S of Pistoia (90315 inhabitants)

42 Km NW of Siena (53903 inhabitants)

48 Km SE of Lucca (89046 inhabitants)

49 Km E of Pisa (89158 inhabitants)

55 Km E of Livorno (159219 inhabitants)

66 Km E of Viareggio (62467 inhabitants)

74 Km W of Arezzo (99543 inhabitants)

83 Km SE of Massa (69479 inhabitants)

89 Km SE of Carrara (63133 inhabitants)

94 Km N of Grosseto (82087 inhabitants)

Recent and historical seismicity

Not available maps for this sismic event.

Seismic hazard

Not available maps for this sismic event.

Shakemap

Not available maps for this sismic event.

Felt maps

Preliminary map of the earthquake effects from the web 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
Reviewed Rev100	ML 1.4	2020-12-05 18:08:22	43.6	10.99	10	2020-12-05 18:22:25	Sala Sismica INGV-Roma	85221771

Preferred location and magnitude until now.

Origin information

Origin

Field	Value
Time (UTC)	2020-12-05 18:08:22 ± 0.18
Latitude	43.60 ± 0.01
Longitude	10.99 ± 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	85221771

Uncertainty

Field	Value
Preferred uncertainty description	uncertainty ellipse
Semi-major axis of confidence ellipse (meter)	797
Semi-minor axis of confidence ellipse (meter)	472
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)	64
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)	128
Number of associated phases, regardless of their use for origin computation	30
Number of defining phases	16
RMS of the travel time residuals of the arrivals used for the origin computation (sec)	0.31
Epicentral distance of station closest to the epicenter (degree)	0
Epicentral distance of station farthest from the epicenter (degree)	0.70507
Number of stations at which the event was observed	19
Number of stations from which data was used for origin computation	8

Magnitude information

ML:1.4

Field	Value
Value	1.4
Uncertainty	0.3
Num. used stations	13
Type of magnitude	ML
Reference to an origin	85221771
Agency	INGV
Autore	Sala Sismica INGV-Roma
Time of creation (UTC)	2020-12-05 18:22:25

Picking and Arrival

SCNL	Time	Uncertainty	Polarity	Evaluation_mode	Phase	Azimuth	Distance	Takeoff_angle	Residual	Weight
IV.PTRJ.HNZ.	2020-12-05T18:10:02.68	3.0	undecidable	manual	Sn				7.05	0
IV.ARCI.HHZ.	2020-12-05T18:09:05.93	3.0	undecidable	manual	S					0
IV.FIR.HHZ.	2020-12-05T18:09:05.91	3.0	undecidable	manual	P					0
IV.MILN.HNZ.	2020-12-05T18:09:03.90	3.0	undecidable	manual	Pg				5.22	0
IV.ARCI.HHZ.	2020-12-05T18:09:00.83	3.0	undecidable	manual	P					0
IV.MC2.EHZ.	2020-12-05T18:08:57.60	3.0	undecidable	manual	Pg				6.21	0
IV.SF01.EHZ.	2020-12-05T18:08:54.20	3.0	undecidable	manual	S					0
IV.SF01.EHZ.	2020-12-05T18:08:49.22	3.0	undecidable	manual	P					0
IV.LMD.HHZ.	2020-12-05T18:08:45.92	0.6	undecidable	manual	S	47	0.7051	50	0	45
IV.CPGN.HNZ.	2020-12-05T18:08:40.65	3.0	undecidable	manual	P				-0.18	0
TV.SF04.EHZ.	2020-12-05T18:08:40.24	3.0	undecidable	manual	P				0.2	0
IV.MOCL.EHE.	2020-12-05T18:08:38.13	0.6	undecidable	manual	S	19	0.4281	50	0.41	44
IV.RUFI.EHZ.	2020-12-05T18:08:37.73	0.3	undecidable	manual	S	58	0.4461	50	-0.52	64
IV.FROS.CHZ.	2020-12-05T18:08:36.80	0.6	undecidable	manual	S	162	0.4083	50	-0.34	45
IV.LMD.HHZ.	2020-12-05T18:08:36.47	0.1	undecidable	manual	P	47	0.7051	50	0.51	81
IV.MPPT.EHE.	2020-12-05T18:08:35.73	0.6	undecidable	manual	S	12	0.3651	50	-0.12	48
IV.PII.HHZ.	2020-12-05T18:08:34.98	0.3	undecidable	manual	S	290	0.3561	50	-0.59	64
IV.RIBO.EHZ.01	2020-12-05T18:08:34.45	3.0	positive	manual	P				-1.23	0
IV.SEI.HHZ.	2020-12-05T18:08:33.82	3.0	undecidable	manual	P					0
IV.CSNT.HHZ.	2020-12-05T18:08:32.37	0.3	undecidable	manual	S	120	0.2536	50	-0.17	72
IV.FROS.CHZ.	2020-12-05T18:08:31.19	0.1	undecidable	manual	P	162	0.4083	50	0.31	91
IV.RUFI.EHZ.	2020-12-05T18:08:31.57	0.1	undecidable	manual	P	58	0.4461	50	0.04	95
IV.MOCL.EHE.	2020-12-05T18:08:31.41	0.1	undecidable	manual	P	19	0.4281	50	0.19	93
IV.PII.HHZ.	2020-12-05T18:08:30.31	0.1	undecidable	manual	P	290	0.3561	50	0.33	91
IV.MPPT.EHE.	2020-12-05T18:08:30.33	0.1	undecidable	manual	P	12	0.3651	50	0.19	94
IV.CRMI.HHZ.	2020-12-05T18:08:30.27	0.3	undecidable	manual	S	358	0.1961	115	-0.39	70
IV.CSNT.HHZ.	2020-12-05T18:08:27.93	0.3	negative	manual	P	120	0.2536	50	-0.3	70
IV.CRMI.HHZ.	2020-12-05T18:08:27.11	0.1	undecidable	manual	P	358	0.1961	115	-0.03	100
IV.TRIF.CHZ.	2020-12-05T18:08:19.19	3.0	undecidable	manual	S					0
IV.TRIF.CHZ.	2020-12-05T18:08:17.88	3.0	undecidable	manual	P					0

Station Magnitude and Amplitude

SCNL	mag	Generic_amplitude	Period	Type	Category	Unit	Time_window_reference
IV.CRMI.HHE.	ML:1.2	0.00010088657	0.1152	AML	other	m	2020-12-05T18:08:31.01
IV.CRMI.HHN.	ML:1	7.5938125E-5	0.1536	AML	other	m	2020-12-05T18:08:31.20
IV.CRMI.HNE.	ML:1.5	0.000212514335	0.1408	AML	other	m	2020-12-05T18:08:31.02
IV.CRMI.HNN.	ML:1.5	0.00019926255	0.1408	AML	other	m	2020-12-05T18:08:31.13
IV.CSNT.HHE.	ML:1.1	5.833435E-5	0.3328	AML	other	m	2020-12-05T18:08:35.30
IV.CSNT.HHN.	ML:1.1	6.2325503E-5	0.2816	AML	other	m	2020-12-05T18:08:34.25
IV.PII.HHE.	ML:1.5	0.00011843355	1.1264	AML	other	m	2020-12-05T18:08:45.64
IV.PII.HHN.	ML:1.2	5.182192855E-5	45.2224	AML	other	m	2020-12-05T18:08:29.00
IV.FROS.CHE.	ML:2.1	0.0003390669	2.432	AML	other	m	2020-12-05T18:08:49.82
IV.FROS.CHN.	ML:1.8	0.0002038084	1.3696	AML	other	m	2020-12-05T18:08:30.69
IV.RUFI.EHE.	ML:1.4	6.558993E-5	0.192	AML	other	m	2020-12-05T18:08:38.80
IV.RUFI.EHN.	ML:1.4	7.187008E-5	47.5264	AML	other	m	2020-12-05T18:08:08.09
IV.RIBO.EHE.01	ML:2.3	0.00032382195	0.1408	AML	other	m	2020-12-05T18:08:52.13
TV.SF04.EHE.	ML:2	9.758617E-5	0.0512	AML	other	m	2020-12-05T18:08:47.12
TV.SF04.EHN.	ML:1.8	6.28562E-5	0.2176	AML	other	m	2020-12-05T18:08:44.03
IV.CPGN.HNN.	ML:2.5	0.00028680059	0.2944	AML	other	m	2020-12-05T18:08:46.48
IV.CPGN.EHE.	ML:2.4	0.00021409095	0.2048	AML	other	m	2020-12-05T18:08:47.33
IV.CPGN.EHN.	ML:2.3	0.000180398146	0.2432	AML	other	m	2020-12-05T18:08:53.13
IV.CPGN.HNE.	ML:2.4	0.000195012	0.256	AML	other	m	2020-12-05T18:08:52.69

TDMT - Time Domain Moment Tensor

Not available TDMT solution for this seismic event.

Fault Plane solutions in the area

Not available maps for this sismic event.

Download

Type	Description	Link
QuakeML - small	Event, Origin, FocalMechanism	Download
QuakeML - full	Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude	Download

Earthquake with magnitude of ML 1.4 on date 05-12-2020 and time 19:08:22 (Italy) in region 1 km SE Castelfiorentino (FI)

Municipalities within 20 km from the epicenter

Municipalities with at least 50000 inhabitants

Preliminary map of the earthquake effects from the web questionnaire

Origin

Uncertainty

Quality

ML:1.4