Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 31-12-2021 and time 13:17:47 (Italy) in region 2 km NW Campotosto (AQ)

A magnitude ML 0.9 earthquake occured in region: 2 km NW Campotosto (AQ), on

  • 31-12-2021 12:17:47 (UTC)
  • 31-12-2021 13:17:47 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.5740, 13.3560 at 16 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
Campotosto AQ 2 542 542
Capitignano AQ 7 665 1207
Amatrice RI 8 2657 3864
Montereale AQ 11 2581 6445
Crognaleto TE 11 1297 7742
Cortino TE 14 656 8398
Barete AQ 15 737 9135
Fano Adriano TE 15 296 9431
Pizzoli AQ 16 4326 13757
Accumoli RI 16 667 14424
Cagnano Amiterno AQ 17 1369 15793
Cittareale RI 17 482 16275
Pietracamela TE 17 271 16546
Rocca Santa Maria TE 19 537 17083
Borbona RI 19 617 17700

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km N of L'Aquila (69753 inhabitants)
30 Km W of Teramo (54892 inhabitants)
58 Km E of Terni (111501 inhabitants)
65 Km W of Montesilvano (53738 inhabitants)
68 Km SE of Foligno (57155 inhabitants)
71 Km W of Chieti (51815 inhabitants)
71 Km W of Pescara (121014 inhabitants)
82 Km NE of Tivoli (56533 inhabitants)
82 Km NE of Guidonia Montecelio (88673 inhabitants)
99 Km SE of Perugia (166134 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 0.9 2021-12-31
12:17:47		 42.5745 13.3555 16 2021-12-31
13:49:52		 Sala Sismica INGV-Roma 99193581
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-31 12:17:47 ± 0.11
Latitude 42.5745 ± 0.0036
Longitude 13.3555 ± 0.0049
Depth (km) 16 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 99193581

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 439
Semi-minor axis of confidence ellipse (meter) 231
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 347
Circular confidence region, given by single value of horizontal uncertainty (meter) 440.0
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 14
Number of defining phases 12
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) 0.23382
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 6
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 99193581
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-31 13:49:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSNT.HHZ. 2021-12-31T12:18:39.62 3.0 undecidable manual Sn 0.18 0
IV.FOSV.EHZ. 2021-12-31T12:18:03.85 3.0 undecidable manual P -0.1 0
IV.LNSS.HHZ. 2021-12-31T12:17:56.96 0.6 undecidable manual S 277 25.9518 110 -0.06 50
IV.MTRA.EHZ. 2021-12-31T12:17:55.51 0.6 undecidable manual S 9 20.4684 117 -0.18 49
IV.TERO.HHZ. 2021-12-31T12:17:55.90 0.6 undecidable manual S 75 20.9679 117 0.09 50
IV.RM33.EHZ. 2021-12-31T12:17:54.16 0.6 undecidable manual S 238 13.5753 132 -0.02 51
IV.SMA1.EHZ. 2021-12-31T12:17:53.03 0.6 undecidable manual S 345 6.3936 154 0.01 52
IV.LNSS.HHZ. 2021-12-31T12:17:52.91 0.1 positive manual P 277 25.9518 110 -0.04 100
IV.CAMP.HHZ. 2021-12-31T12:17:52.88 0.6 undecidable manual S 134 6.0939 156 -0.1 51
IV.MTRA.EHZ. 2021-12-31T12:17:52.18 0.3 undecidable manual P 9 20.4684 117 0 76
IV.TERO.HHZ. 2021-12-31T12:17:52.28 0.3 undecidable manual P 75 20.9679 117 0.04 75
IV.RM33.EHZ. 2021-12-31T12:17:51.30 0.6 undecidable manual P 238 13.5753 132 0 51
IV.SMA1.EHZ. 2021-12-31T12:17:50.85 0.1 negative manual P 345 6.3936 154 0.22 99
IV.CAMP.HHZ. 2021-12-31T12:17:50.48 0.3 undecidable manual P 134 6.0939 156 -0.14 76
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHE. ML:0.8 0.0000668 0.74 AML other m 2021-12-31T12:17:53.84
IV.RM33.EHN. ML:0.8 0.000057300000000000004 0.66 AML other m 2021-12-31T12:17:54.29
IV.SMA1.EHN. ML:0.6 0.00003315 0.6 AML other m 2021-12-31T12:17:54.30
IV.RM33.EHE. ML:1.1 0.0000901 0.18 AML other m 2021-12-31T12:17:54.43
IV.MTRA.EHN. ML:0.9 0.0000453 0.14 AML other m 2021-12-31T12:17:55.77
IV.MTRA.EHE. ML:1.0 0.0000567 0.18 AML other m 2021-12-31T12:17:56.18
IV.LNSS.HHE. ML:1.0 0.0000562 0.46 AML other m 2021-12-31T12:17:57.40
IV.LNSS.HHN. ML:1.0 0.0000463 0.86 AML other m 2021-12-31T12:17:57.44
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