Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 25-12-2021 and time 12:09:11 (UTC) in region 1 km W Amatrice (RI)

A magnitude ML 1.0 earthquake occured in region: 1 km W Amatrice (RI), on

  • 25-12-2021 12:09:11 (UTC)
  • 25-12-2021 13:09:11 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.6300, 13.2820 at 8 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
Amatrice RI 1 2657 2657
Accumoli RI 8 667 3324
Cittareale RI 10 482 3806
Campotosto AQ 11 542 4348
Montereale AQ 12 2581 6929
Capitignano AQ 12 665 7594
Arquata del Tronto AP 16 1178 8772
Borbona RI 18 617 9389
Crognaleto TE 19 1297 10686
Cortino TE 19 656 11342
Acquasanta Terme AP 19 2916 14258
Posta RI 19 694 14952
Cagnano Amiterno AQ 19 1369 16321
Barete AQ 20 737 17058

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km NW of L'Aquila (69753 inhabitants)
35 Km W of Teramo (54892 inhabitants)
53 Km E of Terni (111501 inhabitants)
60 Km SE of Foligno (57155 inhabitants)
72 Km W of Montesilvano (53738 inhabitants)
79 Km W of Pescara (121014 inhabitants)
79 Km W of Chieti (51815 inhabitants)
84 Km NE of Guidonia Montecelio (88673 inhabitants)
84 Km NE of Tivoli (56533 inhabitants)
90 Km SE of Perugia (166134 inhabitants)
99 Km E of Viterbo (67173 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 1.0 2021-12-25
12:09:11		 42.6297 13.2817 9 2022-03-30
13:04:34		 Bollettino Sismico Italiano INGV 100473601
Reviewed
Rev100 		ML 1.2 2021-12-25
12:09:11		 42.627 13.2732 9 2021-12-25
12:32:00		 Sala Sismica INGV-Roma 98957671
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-25 12:09:11 ± 0.09
Latitude 42.6297 ± 0.0018
Longitude 13.2817 ± 0.0024
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 100473601

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 236
Semi-minor axis of confidence ellipse (meter) 118
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 309
Circular confidence region, given by single value of horizontal uncertainty (meter) 240.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 110
Number of associated phases, regardless of their use for origin computation 38
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.12
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.27160
Number of stations at which the event was observed 29
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 100473601
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-02-01 13:14:31

ML:1.2

Field Value
Value 1.2
Uncertainty 0.4
Num. used stations 10
Type of magnitude ML
Reference to an origin 98957671
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-25 12:32:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.TRAV.HHZ. 2021-12-25T12:10:54.79 3.0 undecidable manual Sn 5.2 0
IX.COL3.HHZ.02 2021-12-25T12:10:40.94 3.0 undecidable manual Sg 14.84 0
IV.PTRP.HHZ. 2021-12-25T12:10:38.77 3.0 undecidable manual Sn 1.83 0
IV.MTSN.HHZ. 2021-12-25T12:10:35.67 3.0 undecidable manual Sn -3.12 0
IV.SELL.HHZ. 2021-12-25T12:10:27.35 3.0 undecidable manual Pg 13.13 0
OT.OT17.EHZ. 2021-12-25T12:10:24.85 3.0 undecidable manual Sg 17.370001 0
IV.EUCT.HNZ. 2021-12-25T12:10:24.02 3.0 undecidable manual Sn -1.22 0
IV.SARZ.HHZ. 2021-12-25T12:10:23.47 3.0 undecidable manual Sn -1.42 0
IT.ORP.HGZ. 2021-12-25T12:10:18.38 3.0 undecidable manual Sn 4.71 0
IV.ECTS.HHZ. 2021-12-25T12:10:18.59 3.0 negative manual Pn -3.21 0
IV.IVGP.HHZ. 2021-12-25T12:10:17.75 3.0 undecidable manual Pn 3.18 0
IV.CTI.HHZ. 2021-12-25T12:10:13.12 3.0 undecidable manual Sn 0.21 0
IV.MRB1.HNZ. 2021-12-25T12:10:08.27 3.0 undecidable manual Sn -5.49 0
IX.COL3.HHZ.02 2021-12-25T12:10:00.77 3.0 negative manual Pg 13.4 0
IV.NDIM.HHZ. 2021-12-25T12:09:57.28 3.0 undecidable manual Sn 0.52 0
IV.BARO.EHZ. 2021-12-25T12:09:52.37 3.0 undecidable manual Sg 10.52 0
IV.CMIS.HHZ. 2021-12-25T12:09:49.90 3.0 negative manual Pg 8.87 0
IX.RSF3.HHZ.02 2021-12-25T12:09:44.36 3.0 negative manual Pn 0.99 0
OT.OT17.EHZ. 2021-12-25T12:09:39.10 3.0 negative manual Pn 2.19 0
IV.BSSO.HHZ. 2021-12-25T12:09:34.37 3.0 undecidable manual Pn 0.7 0
IV.CELB.HHZ. 2021-12-25T12:09:33.40 3.0 negative manual Pn 1.21 0
IV.MMO1.EHZ. 2021-12-25T12:09:22.77 0.3 undecidable manual S 7 30.1476 106 -0.06 74
IV.NRCA.HHZ. 2021-12-25T12:09:21.51 0.3 undecidable manual S 329 26.4513 108 -0.08 74
IV.TERO.HHZ. 2021-12-25T12:09:21.53 0.6 undecidable manual S 92 26.3514 108 -0.03 50
IV.IMOL.HNZ. 2021-12-25T12:09:20.61 3.0 positive manual P -0.07 0
IV.LNSS.HHZ. 2021-12-25T12:09:19.49 0.3 undecidable manual S 261 19.9689 113 0.01 76
IV.MMO1.EHZ. 2021-12-25T12:09:18.28 0.3 undecidable manual P 7 30.1476 106 0.05 74
IV.MTRA.EHE. 2021-12-25T12:09:18.69 0.6 undecidable manual S 34 16.9719 117 0.16 49
IV.TERO.HHZ. 2021-12-25T12:09:17.32 0.3 undecidable manual P 92 26.3514 108 -0.18 72
IV.NRCA.HHZ. 2021-12-25T12:09:17.36 0.3 undecidable manual P 329 26.4513 108 -0.16 73
IV.RM33.EHZ. 2021-12-25T12:09:17.72 0.3 undecidable manual S 202 14.4744 120 -0.07 76
IV.LNSS.HHZ. 2021-12-25T12:09:16.43 0.3 undecidable manual P 261 19.9689 113 0.13 74
IV.RM33.EHZ. 2021-12-25T12:09:15.35 0.3 undecidable manual P 202 14.4744 120 0.03 76
IV.MTRA.EHE. 2021-12-25T12:09:15.89 0.3 undecidable manual P 34 16.9719 117 0.13 74
IV.SMA1.EHZ. 2021-12-25T12:09:15.16 0.3 undecidable manual S 89 4.3956 153 -0.13 76
IV.SMA1.EHZ. 2021-12-25T12:09:14.07 0.1 positive manual P 89 4.3956 153 0.19 100
IV.CPGN.EHZ. 2021-12-25T12:09:12.26 3.0 undecidable manual Pn -1.1 0
IV.EL6.EHZ. 2021-12-25T12:08:57.56 3.0 undecidable manual P -9.99 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RM33.EHN. ML:1.1 0.0001225 1.52 AML other m 2021-12-25T12:09:18.80
IV.RM33.EHE. ML:1.0 0.00010475 0.56 AML other m 2021-12-25T12:09:18.17
IV.LNSS.HHE. ML:1.0 0.00008549999999999999 0.82 AML other m 2021-12-25T12:09:20.07
IV.LNSS.HHN. ML:1.0 0.00008595 0.96 AML other m 2021-12-25T12:09:20.29
IV.NRCA.HHE. ML:1.0 0.0000624 0.7 AML other m 2021-12-25T12:09:22.04
IV.NRCA.HHN. ML:0.8 0.000041049999999999995 0.46 AML other m 2021-12-25T12:09:23.01
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