Earthquake 4 km NW Tredozio (FC), Magnitude ML 1.7, 19 November 2021 time 05:23:33 (Timezone Italy)

A magnitude ML 1.7 earthquake occured in region: 4 km NW Tredozio (FC), on

19-11-2021 04:23:33 (UTC)
19-11-2021 05:23:33 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.1040, 11.7110 at 27 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Tredozio	FC	4	1212	1212
Marradi	FI	8	3139	4351
Modigliana	FC	9	4560	8911
Portico e San Benedetto	FC	10	756	9667
Rocca San Casciano	FC	12	1910	11577
Palazzuolo sul Senio	FI	13	1154	12731
Brisighella	RA	14	7639	20370
Dovadola	FC	14	1653	22023
Premilcuore	FC	15	799	22822
Casola Valsenio	RA	15	2617	25439
Riolo Terme	RA	19	5720	31159
Galeata	FC	20	2516	33675

Municipalities with at least 50000 inhabitants

An earthquake occurred to

25 Km SW of Faenza (58541 inhabitants)

28 Km S of Imola (69797 inhabitants)

30 Km W of Forlì (117913 inhabitants)

43 Km W of Cesena (96758 inhabitants)

52 Km NE of Firenze (382808 inhabitants)

52 Km SW of Ravenna (159116 inhabitants)

53 Km SE of Bologna (386663 inhabitants)

55 Km E of Prato (191150 inhabitants)

57 Km NE of Scandicci (50609 inhabitants)

66 Km E of Pistoia (90315 inhabitants)

69 Km W of Rimini (147750 inhabitants)

72 Km N of Arezzo (99543 inhabitants)

82 Km S of Ferrara (133155 inhabitants)

87 Km SE of Modena (184973 inhabitants)

92 Km NE of Siena (53903 inhabitants)

99 Km W of Pesaro (94582 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

Not available maps for this sismic event.

Locations history

Type	Magnitude	Date and Time (UTC)	Latitude	Longitude	Depth (km)	Published time (UTC)	Author	Location ID
Bulletin Rev1000	Md 1.9 ML 1.7	2021-11-19 04:23:33	44.1035	11.7107	27	2022-03-30 13:04:24	Bollettino Sismico Italiano INGV	99108581
Reviewed Rev100	Md 1.9 ML 1.6	2021-11-19 04:23:33	44.1062	11.7132	26	2021-11-19 04:41:47	Sala Sismica INGV-Roma	97577781

Preferred location and magnitude until now.

Origin information

Origin

Field	Value
Time (UTC)	2021-11-19 04:23:33 ± 0.42
Latitude	44.1035 ± 0.0198
Longitude	11.7107 ± 0.0200
Depth (km)	27 ± 3 (from location)
Evaluation mode of Origin	manual
Evaluation status of Origin	reviewed
Version	1000 -> BULLETIN-INGV
Event type	earthquake
Origin ID	99108581

Uncertainty

Field	Value
Preferred uncertainty description	uncertainty ellipse
Semi-major axis of confidence ellipse (meter)	1841
Semi-minor axis of confidence ellipse (meter)	1740
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)	354
Circular confidence region, given by single value of horizontal uncertainty (meter)	1840.0
Confidence level of the uncertainty (%)	68

Quality

Field	Value
Largest azimuthal gap in station distribution as seen from epicenter (degree)	142
Number of associated phases, regardless of their use for origin computation	24
Number of defining phases	8
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)	0.00000
Epicentral distance of station farthest from the epicenter (degree)	0.51441
Number of stations at which the event was observed	20
Number of stations from which data was used for origin computation	4

Magnitudes information

ML:1.6

Field	Value
Value	1.6
Uncertainty	0.1
Num. used stations	2
Type of magnitude	ML
Reference to an origin	97577781
Agency	INGV
Autore	Sala Sismica INGV-Roma
Time of creation (UTC)	2021-11-19 04:41:47

ML:1.7

Field	Value
Value	1.7
Uncertainty	0.1
Num. used stations	4
Type of magnitude	ML
Reference to an origin	99108581
Agency	INGV
Autore	Bollettino Sismico Italiano INGV
Time of creation (UTC)	2022-03-20 08:05:32

Md:1.9

Field	Value
Value	1.9
Uncertainty	0.2
Num. used stations	4
Type of magnitude	Md
Reference to an origin	99108581
Agency	INGV
Autore	Bollettino Sismico Italiano INGV
Time of creation (UTC)	2022-03-20 08:05:32

Md:1.9

Field	Value
Value	1.9
Uncertainty	0.2
Num. used stations	4
Type of magnitude	Md
Reference to an origin	97577781
Agency	INGV
Autore	Sala Sismica INGV-Roma
Time of creation (UTC)	2021-11-19 04:41:47

Picking and Arrival

SCNL	Time	Uncertainty	Polarity	Evaluation_mode	Phase	Azimuth	Distance(km)	Takeoff_angle	Residual	Weight
IV.CRE.HHZ.	2021-11-19T04:23:51.94	0.6	undecidable	manual	S	160	57.0984	110	0.43	42
IV.SEI.HHZ.	2021-11-19T04:23:45.04	0.6	undecidable	manual	S	259	28.5492	129	0.26	47
IV.CRE.HHZ.	2021-11-19T04:23:43.66	0.3	undecidable	manual	P	160	57.0984	110	-0.04	70
IV.BRIS.HHZ.	2021-11-19T04:23:42.69	0.3	undecidable	manual	S	18	14.1747	150	0.46	68
IV.LMD.HHZ.	2021-11-19T04:23:41.11	0.6	undecidable	manual	S	185	2.8971	173	-0.15	50
IV.SEI.HHZ.	2021-11-19T04:23:39.84	0.1	undecidable	manual	P	259	28.5492	129	0.02	98
IV.BRIS.HHZ.	2021-11-19T04:23:38.28	0.1	undecidable	manual	P	18	14.1747	150	-0.07	100
IV.LMD.HHZ.	2021-11-19T04:23:37.31	0.1	undecidable	manual	P	185	2.8971	173	-0.48	93
IV.ARVD.HHZ.	2021-11-19T04:23:32.05	3.0	undecidable	manual	Sg				16.85	0
IV.MNTV.EHZ.	2021-11-19T04:23:28.74	3.0	positive	manual	P				-9.99	0
IV.IST3.HHZ.	2021-11-19T04:23:27.82	3.0	undecidable	manual	Sg				11.55	0
IV.PE3.EHZ.	2021-11-19T04:23:17.08	3.0	undecidable	manual	Sn				-5.19	0
IV.NARO.HHZ.	2021-11-19T04:23:16.65	3.0	undecidable	manual	Sn				-3.48	0
MN.TRI.HHZ.	2021-11-19T04:23:02.05	3.0	positive	manual	P				-9.99	0
IV.VCEL.EHZ.	2021-11-19T04:22:58.30	3.0	undecidable	manual	Sg				4.89	0
IV.FIAM.HHZ.	2021-11-19T04:22:58.18	3.0	undecidable	manual	Sn				0.14	0
IV.AGLI.HHZ.	2021-11-19T04:22:57.17	3.0	undecidable	manual	P				-9.99	0
OT.TAR1.HHZ.	2021-11-19T04:22:32.07	3.0	negative	manual	P				-9.99	0
IX.PGN3.HHZ.02	2021-11-19T04:22:25.46	3.0	undecidable	manual	P				-9.99	0
IV.IFOR.HHZ.	2021-11-19T04:22:24.74	3.0	positive	manual	P				-9.99	0
OT.OT17.EHZ.	2021-11-19T04:22:22.68	3.0	negative	manual	P				-9.99	0
IV.RNI2.HHZ.	2021-11-19T04:22:21.91	3.0	undecidable	manual	P				-9.99	0
IV.MOCO.HHZ.	2021-11-19T04:22:20.80	3.0	undecidable	manual	P				-9.99	0
IX.CMP3.EHZ.02	2021-11-19T04:22:20.10	3.0	negative	manual	P				-9.99	0

Station Magnitude and Amplitude

SCNL	mag	Generic_amplitude	Period	Type	Category	Unit	Time_window_reference
IV.BRIS.HHN.	ML:1.8	0.0002825	1.38	AML	other	m	2021-11-19T04:23:42.99
IV.BRIS.HHE.	ML:1.6	0.0001815	0.74	AML	other	m	2021-11-19T04:23:43.20
IV.SEI.HHN.	ML:1.9	0.00026649999999999997	0.46	AML	other	m	2021-11-19T04:23:45.85
IV.SEI.HHE.	ML:1.7	0.000175	1.22	AML	other	m	2021-11-19T04:23:46.68

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 1.7 on date 19-11-2021 and time 05:23:33 (Italy) in region 4 km NW Tredozio (FC)

Municipalities within 20 km from the epicenter

Municipalities with at least 50000 inhabitants

Origin

Uncertainty

Quality

ML:1.6

ML:1.7

Md:1.9

Md:1.9