Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 24-12-2021 and time 15:37:05 (UTC) in region 5 km W Castel Ritaldi (PG)

A magnitude ML 1.4 earthquake occured in region: 5 km W Castel Ritaldi (PG), on

  • 24-12-2021 15:37:05 (UTC)
  • 24-12-2021 16:37:05 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8070, 12.6210 at 10 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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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Castel Ritaldi PG 5 3278 3278
Giano dell'Umbria PG 5 3846 7124
Massa Martana PG 9 3770 10894
Montefalco PG 10 5679 16573
Spoleto PG 13 38218 54791
Gualdo Cattaneo PG 13 6155 60946
Campello sul Clitunno PG 13 2442 63388
Trevi PG 13 8469 71857
Acquasparta TR 14 4778 76635
Bevagna PG 14 5081 81716
Todi PG 18 16851 98567
Collazzone PG 18 3473 102040
Foligno PG 18 57155 159195
Sant'Anatolia di Narco PG 19 564 159759

Municipalities with at least 50000 inhabitants

An earthquake occurred to
18 Km SW of Foligno (57155 inhabitants)
27 Km N of Terni (111501 inhabitants)
38 Km SE of Perugia (166134 inhabitants)
60 Km NE of Viterbo (67173 inhabitants)
81 Km NW of L'Aquila (69753 inhabitants)
90 Km W of Teramo (54892 inhabitants)
90 Km N of Guidonia Montecelio (88673 inhabitants)
95 Km SE of Arezzo (99543 inhabitants)
95 Km N of Tivoli (56533 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 1.4 2021-12-24
15:37:05		 42.8072 12.6213 10 2022-03-30
13:04:24		 Bollettino Sismico Italiano INGV 99145181
Reviewed
Rev100 		ML 1.4 2021-12-24
15:37:05		 42.8097 12.6207 10 2021-12-24
15:41:21		 Sala Sismica INGV-Roma 98919421
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-24 15:37:05 ± 0.06
Latitude 42.8072 ± 0.0027
Longitude 12.6213 ± 0.0074
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 99145181

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 564
Semi-minor axis of confidence ellipse (meter) 281
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 263
Circular confidence region, given by single value of horizontal uncertainty (meter) 560.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 102
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.13
Epicentral distance of station closest to the epicenter (degree) 0.03777
Epicentral distance of station farthest from the epicenter (degree) 0.55308
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 99145181
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-30 10:41:11

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 98919421
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-24 15:41:21
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MML1.EHZ. 2021-12-24T15:37:20.84 0.6 undecidable manual S 40 44.3223 50 0.26 45
IV.NRCA.HHZ. 2021-12-24T15:37:19.46 0.6 undecidable manual S 86 40.2264 50 -0.02 48
IV.LNSS.HHZ. 2021-12-24T15:37:19.50 0.6 undecidable manual S 123 41.0256 50 -0.19 46
IV.SMA1.EHZ. 2021-12-24T15:37:17.43 1.0 positive manual P 108 61.3941 50 0.38 21
IV.CESI.HHZ. 2021-12-24T15:37:16.99 0.6 undecidable manual S 46 31.8459 50 -0.25 46
IV.GAVE.EHZ. 2021-12-24T15:37:15.57 0.6 undecidable manual S 120 25.6521 111 0.06 49
IV.ASSB.HHZ. 2021-12-24T15:37:15.71 0.6 undecidable manual S 7 26.2515 110 -0.02 49
IV.MML1.EHZ. 2021-12-24T15:37:14.33 1.0 undecidable manual P 40 44.3223 50 -0.09 23
IV.CESX.HHZ. 2021-12-24T15:37:14.41 0.6 undecidable manual S 187 22.2555 114 -0.01 49
IV.FDMO.HHZ. 2021-12-24T15:37:14.59 1.0 negative manual P 56 45.621 50 -0.02 24
IV.LNSS.HHZ. 2021-12-24T15:37:14.05 0.1 undecidable manual P 123 41.0256 50 0.15 93
IV.NRCA.HHZ. 2021-12-24T15:37:13.63 0.1 undecidable manual P 86 40.2264 50 -0.15 93
IV.CESI.HHZ. 2021-12-24T15:37:12.44 0.1 positive manual P 46 31.8459 50 -0.04 97
IV.ASSB.HHZ. 2021-12-24T15:37:11.81 0.6 undecidable manual P 7 26.2515 110 0.19 47
IV.GAVE.EHZ. 2021-12-24T15:37:11.53 1.0 negative manual P 120 25.6521 111 0.04 24
IV.CESX.HHZ. 2021-12-24T15:37:10.88 0.3 positive manual P 187 22.2555 114 0.02 74
IV.MOMA.HHZ. 2021-12-24T15:37:09.36 0.6 undecidable manual S 265 4.1958 157 -0.32 48
IV.MOMA.HHZ. 2021-12-24T15:37:08.23 0.1 positive manual P 265 4.1958 157 0.11 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HNN. ML:1.9 0.0015350000000000001 0.28 AML other m 2021-12-24T15:37:09.78
IV.MOMA.HHN. ML:1.9 0.00151 0.28 AML other m 2021-12-24T15:37:09.78
IV.MOMA.HHE. ML:2.1 0.00212 0.2 AML other m 2021-12-24T15:37:09.91
IV.MOMA.HNE. ML:2.0 0.00203 0.18 AML other m 2021-12-24T15:37:09.91
IV.CESX.HHE. ML:1.5 0.00020050000000000002 0.6 AML other m 2021-12-24T15:37:15.88
IV.CESX.HHN. ML:1.5 0.00021450000000000004 0.3 AML other m 2021-12-24T15:37:15.95
IV.ASSB.HHN. ML:1.4 0.000124 1.58 AML other m 2021-12-24T15:37:16.01
IV.ASSB.HHE. ML:1.3 0.00011 0.96 AML other m 2021-12-24T15:37:16.55
IV.GAVE.EHE. ML:1.4 0.00014600000000000003 0.18 AML other m 2021-12-24T15:37:18.11
IV.GAVE.EHN. ML:1.4 0.0001295 0.16 AML other m 2021-12-24T15:37:18.29
IV.CESI.HHE. ML:1.0 0.000051750000000000004 1.16 AML other m 2021-12-24T15:37:19.95
IV.CESI.HHN. ML:1.3 0.00009005 1.58 AML other m 2021-12-24T15:37:20.14
IV.NRCA.HHE. ML:1.4 0.000097 0.12 AML other m 2021-12-24T15:37:21.10
IV.LNSS.HHN. ML:1.4 0.00008355 0.96 AML other m 2021-12-24T15:37:21.27
IV.LNSS.HHE. ML:1.4 0.000095 0.26 AML other m 2021-12-24T15:37:22.15
IV.NRCA.HHN. ML:1.3 0.00006785 0.68 AML other m 2021-12-24T15:37:22.16
IV.FDMO.HHN. ML:1.0 0.0000316 0.48 AML other m 2021-12-24T15:37:23.58
IV.FDMO.HHE. ML:1.1 0.0000412 0.8 AML other m 2021-12-24T15:37:23.80
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download