Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 04-12-2021 and time 22:24:36 (UTC) in region 2 km SE Cascia (PG)

A magnitude ML 1.4 earthquake occured in region: 2 km SE Cascia (PG), on

  • 04-12-2021 22:24:36 (UTC)
  • 04-12-2021 23:24:36 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7080, 13.0360 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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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Cascia PG 2 3217 3217
Poggiodomo PG 8 117 3334
Monteleone di Spoleto PG 9 599 3933
Norcia PG 11 4957 8890
Cittareale RI 14 482 9372
Vallo di Nera PG 16 364 9736
Cerreto di Spoleto PG 16 1075 10811
Sant'Anatolia di Narco PG 17 564 11375
Scheggino PG 17 461 11836
Leonessa RI 17 2435 14271
Accumoli RI 17 667 14938
Preci PG 19 724 15662

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km E of Terni (111501 inhabitants)
39 Km SE of Foligno (57155 inhabitants)
50 Km NW of L'Aquila (69753 inhabitants)
55 Km W of Teramo (54892 inhabitants)
69 Km SE of Perugia (166134 inhabitants)
83 Km NE of Guidonia Montecelio (88673 inhabitants)
83 Km E of Viterbo (67173 inhabitants)
85 Km N of Tivoli (56533 inhabitants)
94 Km W of Montesilvano (53738 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
Reviewed
Rev100 		ML 1.4 2021-12-04
22:24:36		 42.708 13.0362 11 2021-12-04
22:36:22		 Sala Sismica INGV-Roma 98146401
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-04 22:24:36 ± 0.07
Latitude 42.7080 ± 0.0036
Longitude 13.0362 ± 0.0073
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 98146401

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 607
Semi-minor axis of confidence ellipse (meter) 302
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 273
Circular confidence region, given by single value of horizontal uncertainty (meter) 610.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 122
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) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.33005
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:1.4

Field Value
Value 1.4
Uncertainty 0.1
Num. used stations 10
Type of magnitude ML
Reference to an origin 98146401
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-04 22:36:22
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
HL.VLS.HHZ. 2021-12-04T22:26:16.82 3.0 undecidable manual Pn -4.09 0
IX.SCL3.EHZ.02 2021-12-04T22:26:15.73 3.0 undecidable manual Sg 16.639999 0
IX.CSG3.HNZ.01 2021-12-04T22:25:57.35 3.0 undecidable manual Sn 1.09 0
IV.CADC.HNZ. 2021-12-04T22:25:52.66 3.0 undecidable manual Sg 16.25 0
SL.LJU.BHZ. 2021-12-04T22:25:44.37 3.0 undecidable manual Sn -4.13 0
OT.OT17.EHZ. 2021-12-04T22:25:37.32 3.0 undecidable manual Sn -3.18 0
IX.CMP3.EHZ.02 2021-12-04T22:25:29.33 3.0 negative manual Pg 13.66 0
IV.BOZZ.EHZ. 2021-12-04T22:25:26.46 3.0 undecidable manual Sn 0.5 0
IV.LAV9.HNZ. 2021-12-04T22:25:17.55 3.0 undecidable manual Sg 4.16 0
IV.MCRV.HHZ. 2021-12-04T22:25:17.31 3.0 undecidable manual Pn 2.5 0
IV.PAOL.HHZ. 2021-12-04T22:25:08.32 3.0 undecidable manual Pn 0 0
IV.TREG.EHZ. 2021-12-04T22:24:58.81 3.0 undecidable manual Pn -2.36 0
IV.OSSC.HHZ. 2021-12-04T22:24:50.12 3.0 undecidable manual S -1.63 0
IV.FDMO.HHN. 2021-12-04T22:24:48.64 0.3 undecidable manual S 6 36.6411 50 -0.23 69
IV.SACS.HHZ. 2021-12-04T22:24:45.66 3.0 undecidable manual S -0.62 0
IV.RM33.EHZ. 2021-12-04T22:24:45.98 0.3 undecidable manual S 147 26.4513 50 -0.16 71
IV.CESI.HNZ. 2021-12-04T22:24:44.29 1.0 undecidable manual P 342 34.6431 50 0.97 18
IV.IMOL.HNZ. 2021-12-04T22:24:44.68 3.0 negative manual P 0.44 0
IV.MMUR.HNZ. 2021-12-04T22:24:43.29 3.0 undecidable manual S -1.18 0
IV.FDMO.HHN. 2021-12-04T22:24:43.77 0.3 undecidable manual P 6 36.6411 50 0.13 70
IV.RM33.EHZ. 2021-12-04T22:24:42.09 0.3 undecidable manual P 147 26.4513 50 0.03 73
IV.LMD.HHZ. 2021-12-04T22:24:42.30 3.0 negative manual P 1.36 0
IV.NRCA.HHZ. 2021-12-04T22:24:42.86 0.1 undecidable manual S 25 15.2736 124 -0.07 98
IV.MC2.EHZ. 2021-12-04T22:24:42.14 3.0 undecidable manual P 0
IV.GAVE.EHZ. 2021-12-04T22:24:41.80 0.1 undecidable manual S 261 11.6772 132 -0.15 97
IV.LNSS.HHZ. 2021-12-04T22:24:41.93 0.1 undecidable manual S 178 11.6772 132 -0.01 100
IV.NRCA.HHZ. 2021-12-04T22:24:40.26 0.1 undecidable manual P 25 15.2736 124 0.05 99
IV.GAVE.EHZ. 2021-12-04T22:24:39.68 0.1 undecidable manual P 261 11.6772 132 0.04 99
IV.LNSS.HHZ. 2021-12-04T22:24:39.74 0.1 undecidable manual P 178 11.6772 132 0.11 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LNSS.HHN. ML:1.3 0.0002255 0.1 AML other m 2021-12-04T22:24:42.28
IV.LNSS.HHE. ML:1.5 0.00034050000000000004 0.1 AML other m 2021-12-04T22:24:42.40
IV.GAVE.EHN. ML:1.5 0.00036389355000000003 0.2048 AML other m 2021-12-04T22:24:42.47
IV.GAVE.EHE. ML:1.4 0.0003075 0.18 AML other m 2021-12-04T22:24:42.88
IV.NRCA.HHN. ML:1.4 0.00022 0.08 AML other m 2021-12-04T22:24:42.95
IV.NRCA.HHE. ML:1.6 0.00035541694999999994 0.1792 AML other m 2021-12-04T22:24:42.96
IV.GAVE.HNE. ML:1.4 0.00028243305 0.1792 AML other m 2021-12-04T22:24:42.78
IV.LNSS.HNE. ML:1.4 0.00030031855 0.1152 AML other m 2021-12-04T22:24:42.39
IV.LNSS.HNN. ML:1.3 0.00022146690000000003 0.1024 AML other m 2021-12-04T22:24:42.28
IV.NRCA.HNE. ML:1.6 0.00033264709999999997 0.128 AML other m 2021-12-04T22:24:43.10
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