Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 23-12-2020 and time 10:23:58 (UTC) in region 3 km NE Accumoli (RI)

A magnitude ML 1.0 earthquake occured in region: 3 km NE Accumoli (RI), on

  • 23-12-2020 10:23:58 (UTC)
  • 23-12-2020 11:23:58 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7160, 13.2780 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
Accumoli RI 3 667 667
Arquata del Tronto AP 7 1178 1845
Amatrice RI 10 2657 4502
Acquasanta Terme AP 12 2916 7418
Cittareale RI 14 482 7900
Montegallo AP 15 523 8423
Norcia PG 17 4957 13380
Valle Castellana TE 18 977 14357
Campotosto AQ 19 542 14899

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km W of Teramo (54892 inhabitants)
42 Km N of L'Aquila (69753 inhabitants)
54 Km SE of Foligno (57155 inhabitants)
54 Km E of Terni (111501 inhabitants)
75 Km W of Montesilvano (53738 inhabitants)
82 Km W of Pescara (121014 inhabitants)
83 Km W of Chieti (51815 inhabitants)
85 Km SE of Perugia (166134 inhabitants)
91 Km NE of Guidonia Montecelio (88673 inhabitants)
92 Km NE 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
Reviewed
Rev100 		ML 1.0 2020-12-23
10:23:58		 42.7155 13.2783 11 2020-12-23
10:28:06		 Sala Sismica INGV-Roma 85647141
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-23 10:23:58 ± 0.06
Latitude 42.7155 ± 0.0036
Longitude 13.2783 ± 0.0049
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 85647141

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 386
Semi-minor axis of confidence ellipse (meter) 348
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 200
Circular confidence region, given by single value of horizontal uncertainty (meter) 390.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 111
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 12
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.28329
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 85647141
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-23 10:28:06
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IT.LRNO.HNZ. 2020-12-23T10:24:26.07 3.0 undecidable manual Pg 0.11 0
IV.GAVE.EHZ. 2020-12-23T10:24:08.95 0.3 undecidable manual S 265 31.4463 91 0.08 73
IV.TERO.HHZ. 2020-12-23T10:24:07.89 0.6 undecidable manual S 111 28.4493 91 -0.2 48
IV.LNSS.HHZ. 2020-12-23T10:24:06.60 0.6 undecidable manual S 237 23.0547 91 -0.05 49
IV.NRCA.HHZ. 2020-12-23T10:24:05.26 0.3 undecidable manual S 314 18.6702 92 -0.22 72
IV.GAVE.EHZ. 2020-12-23T10:24:04.27 0.3 undecidable manual P 265 31.4463 91 -0.02 74
IV.SMA1.EHZ. 2020-12-23T10:24:03.20 0.3 undecidable manual S 154 10.4784 119 -0.15 74
IV.LNSS.HHZ. 2020-12-23T10:24:03.02 0.1 undecidable manual P 237 23.0547 91 0.01 100
IV.MTRA.HNZ. 2020-12-23T10:24:03.28 0.3 undecidable manual S 65 10.6782 118 -0.1 75
IV.TERO.HHZ. 2020-12-23T10:24:03.84 0.1 undecidable manual P 111 28.4493 91 0 99
IV.NRCA.HHZ. 2020-12-23T10:24:02.38 0.1 undecidable manual P 314 18.6702 92 0.05 100
IV.SMA1.EHZ. 2020-12-23T10:24:01.28 0.1 negative manual P 154 10.4784 119 0.18 99
IV.MTRA.HNZ. 2020-12-23T10:24:01.30 0.1 undecidable manual P 65 10.6782 118 0.18 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHN. ML:1.1 0.00015260000000000002 0.2 AML other m 2020-12-23T10:24:03.28
IV.SMA1.EHE. ML:1.0 0.00010875 0.38 AML other m 2020-12-23T10:24:03.28
IV.MTRA.EHN. ML:1.1 0.0001315 0.24 AML other m 2020-12-23T10:24:03.50
IV.MTRA.EHE. ML:1.2 0.0001805 0.92 AML other m 2020-12-23T10:24:04.81
IV.NRCA.HHE. ML:1.1 0.00009984999999999999 0.2 AML other m 2020-12-23T10:24:05.46
IV.NRCA.HHN. ML:1.0 0.0000769 0.14 AML other m 2020-12-23T10:24:05.51
IV.LNSS.HHN. ML:0.9 0.00004575 0.58 AML other m 2020-12-23T10:24:07.99
IV.LNSS.HHE. ML:0.8 0.000038100000000000005 1.3 AML other m 2020-12-23T10:24:08.86
IV.TERO.HHN. ML:0.8 0.00003715 1.22 AML other m 2020-12-23T10:24:08.21
IV.TERO.HHE. ML:1.0 0.0000461 0.08 AML other m 2020-12-23T10:24:08.92
IV.GAVE.EHE. ML:0.7 0.00002265 1.38 AML other m 2020-12-23T10:24:10.18
IV.GAVE.EHN. ML:0.7 0.000024035 1 AML other m 2020-12-23T10:24:10.77
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