Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 22-12-2021 and time 19:36:23 (Italy) in region 7 km E Norcia (PG)

A magnitude ML 1.1 earthquake occured in region: 7 km E Norcia (PG), on

  • 22-12-2021 18:36:23 (UTC)
  • 22-12-2021 19:36:23 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7810, 13.1820 at 11 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
Norcia PG 7 4957 4957
Arquata del Tronto AP 10 1178 6135
Accumoli RI 11 667 6802
Castelsantangelo sul Nera MC 13 281 7083
Montegallo AP 14 523 7606
Cascia PG 15 3217 10823
Preci PG 16 724 11547
Montemonaco AP 18 604 12151
Cittareale RI 18 482 12633
Visso MC 18 1107 13740
Acquasanta Terme AP 19 2916 16656
Ussita MC 19 444 17100
Amatrice RI 19 2657 19757

Municipalities with at least 50000 inhabitants

An earthquake occurred to
44 Km E of Foligno (57155 inhabitants)
45 Km W of Teramo (54892 inhabitants)
50 Km E of Terni (111501 inhabitants)
51 Km NW of L'Aquila (69753 inhabitants)
74 Km E of Perugia (166134 inhabitants)
85 Km W of Montesilvano (53738 inhabitants)
91 Km W of Pescara (121014 inhabitants)
94 Km NW of Chieti (51815 inhabitants)
94 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km NE of Tivoli (56533 inhabitants)
97 Km E of Viterbo (67173 inhabitants)
97 Km S of Ancona (100861 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 1.1 2021-12-22
18:36:23		 42.7807 13.1822 11 2021-12-22
18:42:00		 Sala Sismica INGV-Roma 98826631
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-22 18:36:23 ± 0.04
Latitude 42.7807 ± 0.0027
Longitude 13.1822 ± 0.0025
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 98826631

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 274
Semi-minor axis of confidence ellipse (meter) 229
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 31
Circular confidence region, given by single value of horizontal uncertainty (meter) 270.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 104
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.31117
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 98826631
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-22 18:42:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.APEC.HHZ. 2021-12-22T18:36:52.34 3.0 undecidable manual S 0.14 0
IV.CSP1.EHZ. 2021-12-22T18:36:35.55 0.6 undecidable manual S 3 34.5432 50 -0.02 48
IV.GAVE.EHZ. 2021-12-22T18:36:33.00 0.3 undecidable manual S 247 25.4523 50 -0.13 72
IV.TERO.HHZ. 2021-12-22T18:36:31.19 3.0 undecidable manual P -0.07 0
IV.SMA1.EHZ. 2021-12-22T18:36:31.85 0.6 undecidable manual S 143 20.868 50 -0.05 49
IV.MMO1.EHZ. 2021-12-22T18:36:30.93 0.6 undecidable manual S 42 17.6712 122 -0.12 49
IV.MTRA.EHZ. 2021-12-22T18:36:30.89 0.6 undecidable manual S 99 17.6712 122 -0.15 48
IV.CSP1.EHZ. 2021-12-22T18:36:30.59 1.0 positive manual P 3 34.5432 50 -0.02 24
IV.MC2.EHZ. 2021-12-22T18:36:30.20 0.6 undecidable manual S 2 14.4744 127 0.06 50
IV.FDMO.HHZ. 2021-12-22T18:36:29.67 1.0 positive manual P 345 29.4483 50 -0.15 24
IV.GAVE.EHZ. 2021-12-22T18:36:29.33 1.0 positive manual P 247 25.4523 50 0.12 24
IV.SMA1.EHZ. 2021-12-22T18:36:28.60 0.1 undecidable manual P 143 20.868 50 0.11 97
IV.GUMA.HHZ. 2021-12-22T18:36:28.79 3.0 positive manual P -0.59 0
IV.MMO1.EHZ. 2021-12-22T18:36:28.01 0.3 undecidable manual P 42 17.6712 122 0.01 75
IV.NRCA.HHZ. 2021-12-22T18:36:28.33 0.6 undecidable manual S 317 8.0808 144 -0.22 49
IV.MTRA.EHZ. 2021-12-22T18:36:28.00 0.1 undecidable manual P 99 17.6712 122 0 100
IV.MC2.EHZ. 2021-12-22T18:36:27.64 0.6 negative manual P 2 14.4744 127 0.16 49
IV.NRCA.HHZ. 2021-12-22T18:36:26.69 0.1 positive manual P 317 8.0808 144 0.13 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.3 0.00024349999999999998 0.2 AML other m 2021-12-22T18:36:28.64
IV.NRCA.HHN. ML:1.2 0.000202 0.08 AML other m 2021-12-22T18:36:29.08
IV.GAVE.EHE. ML:1.1 0.0000637 0.56 AML other m 2021-12-22T18:36:33.82
IV.GAVE.EHN. ML:1.0 0.0000571 0.54 AML other m 2021-12-22T18:36:33.62
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