Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 04-12-2020 and time 08:38:00 (UTC) in region 4 km E Accumoli (RI)

A magnitude ML 1.2 earthquake occured in region: 4 km E Accumoli (RI), on

  • 04-12-2020 08:38:00 (UTC)
  • 04-12-2020 09:38:00 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7110, 13.2990 at 13 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 5 667 667
Arquata del Tronto AP 7 1178 1845
Amatrice RI 9 2657 4502
Acquasanta Terme AP 11 2916 7418
Montegallo AP 15 523 7941
Cittareale RI 15 482 8423
Valle Castellana TE 17 977 9400
Campotosto AQ 18 542 9942
Rocca Santa Maria TE 19 537 10479
Norcia PG 19 4957 15436
Cortino TE 20 656 16092

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km W of Teramo (54892 inhabitants)
41 Km N of L'Aquila (69753 inhabitants)
56 Km E of Foligno (57155 inhabitants)
56 Km E of Terni (111501 inhabitants)
73 Km W of Montesilvano (53738 inhabitants)
80 Km W of Pescara (121014 inhabitants)
82 Km W of Chieti (51815 inhabitants)
86 Km SE of Perugia (166134 inhabitants)
92 Km NE of Guidonia Montecelio (88673 inhabitants)
93 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 1.2 2020-12-04
08:38:00		 42.7107 13.2993 13 2020-12-04
08:46:33		 Sala Sismica INGV-Roma 85194351
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-04 08:38:00 ± 0.15
Latitude 42.7107 ± 0.0081
Longitude 13.2993 ± 0.0110
Depth (km) 13 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 85194351

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 931
Semi-minor axis of confidence ellipse (meter) 794
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 205
Circular confidence region, given by single value of horizontal uncertainty (meter) 930.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 105
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.07734
Epicentral distance of station farthest from the epicenter (degree) 0.38761
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 7
Type of magnitude ML
Reference to an origin 85194351
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-04 08:46:43
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.NRCA.HHZ. 2020-12-04T08:38:08.18 0.3 undecidable manual S 312 20.3685 104 -0.13 75
IV.MMO1.EHZ. 2020-12-04T08:38:08.68 0.6 undecidable manual S 6 21.0678 103 0.18 50
IV.CSP1.EHZ. 2020-12-04T08:38:08.53 1.0 negative manual P 350 43.0236 94 0.12 24
IV.SMA1.EHZ. 2020-12-04T08:38:05.34 0.6 undecidable manual S 162 9.3795 134 -0.38 49
IV.T1299.EHE. 2020-12-04T08:38:05.65 0.6 undecidable manual S 189 8.5803 137 0.07 51
IV.TERO.HHZ. 2020-12-04T08:38:05.69 0.6 undecidable manual P 111 26.6511 98 -0.22 48
IV.LNSS.HNE. 2020-12-04T08:38:05.37 0.6 undecidable manual P 241 24.2535 100 -0.17 50
IV.MMO1.EHZ. 2020-12-04T08:38:05.24 1.0 positive manual P 6 21.0678 103 0.18 25
IV.NRCA.HHZ. 2020-12-04T08:38:04.92 0.3 undecidable manual P 312 20.3685 104 -0.03 77
IV.SMA1.EHZ. 2020-12-04T08:38:03.57 0.6 undecidable manual P 162 9.3795 134 0.12 51
IV.T1299.EHE. 2020-12-04T08:38:03.60 0.1 undecidable manual P 189 8.5803 137 0.23 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHE. ML:1.0 0.00011587814999999999 0.096 AML other m 2020-12-04T08:38:05.87
IV.SMA1.EHN. ML:1.3 0.00020271044999999998 0.1408 AML other m 2020-12-04T08:38:05.69
IV.NRCA.HNE. ML:1.3 0.0001278764 0.16 AML other m 2020-12-04T08:38:08.30
IV.NRCA.HNN. ML:1.5 0.0002210884 1.1456 AML other m 2020-12-04T08:38:12.54
IV.NRCA.HHE. ML:1.2 0.00011600986999999999 0.1024 AML other m 2020-12-04T08:38:08.35
IV.NRCA.HHN. ML:1.2 0.000099880515 0.0832 AML other m 2020-12-04T08:38:08.28
IV.TERO.HHE. ML:0.6 0.00001760222 0.16 AML other m 2020-12-04T08:38:09.86
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