Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 28-11-2020 and time 07:45:05 (UTC) in region 4 km N Accumoli (RI)

A magnitude ML 1.6 earthquake occured in region: 4 km N Accumoli (RI), on

  • 28-11-2020 07:45:05 (UTC)
  • 28-11-2020 08:45:05 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.73, 13.26 at 10 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 4 667 667
Arquata del Tronto AP 6 1178 1845
Amatrice RI 12 2657 4502
Acquasanta Terme AP 13 2916 7418
Montegallo AP 14 523 7941
Norcia PG 15 4957 12898
Cittareale RI 15 482 13380
Montemonaco AP 20 604 13984
Cascia PG 20 3217 17201
Valle Castellana TE 20 977 18178
Castelsantangelo sul Nera MC 20 281 18459

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km W of Teramo (54892 inhabitants)
44 Km N of L'Aquila (69753 inhabitants)
51 Km E of Foligno (57155 inhabitants)
53 Km E of Terni (111501 inhabitants)
77 Km W of Montesilvano (53738 inhabitants)
82 Km SE of Perugia (166134 inhabitants)
84 Km W of Pescara (121014 inhabitants)
86 Km NW of Chieti (51815 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
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.6 2020-11-28
07:45:05		 42.73 13.26 10 2020-11-28
08:09:55		 Sala Sismica INGV-Roma 85063081
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-11-28 07:45:05 ± 0.08
Latitude 42.73 ± 0.00
Longitude 13.26 ± 0.01
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 85063081

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 620
Semi-minor axis of confidence ellipse (meter) 133
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 241
Circular confidence region, given by single value of horizontal uncertainty (meter) 620
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 83
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.37412
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.4
Num. used stations 16
Type of magnitude ML
Reference to an origin 85063081
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-11-28 08:09:55
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.SAMA.EHZ. 2020-11-28T07:45:23.65 3.0 negative manual P -2.9 0
IV.CSP1.EHZ. 2020-11-28T07:45:18.95 0.3 undecidable manual S 354 0.3606 50 0.04 71
IV.MF5.EHZ. 2020-11-28T07:45:17.58 0.1 undecidable manual S 30 0.295 50 0.61 83
IV.FDMO.HHZ. 2020-11-28T07:45:17.78 0.1 undecidable manual S 338 0.3283 50 -0.15 94
IV.TERO.HHZ. 2020-11-28T07:45:15.93 0.1 undecidable manual S 113 0.2779 50 -0.53 88
IV.OFFI.HHZ. 2020-11-28T07:45:14.14 0.1 undecidable manual P 57 0.3741 50 0.63 81
IV.LNSS.HHZ. 2020-11-28T07:45:14.55 0.3 undecidable manual S 231 0.205 114 0.3 70
IV.CAMP.HHZ. 2020-11-28T07:45:14.77 0.1 undecidable manual S 150 0.2266 50 -0.16 96
IV.MC2.EHZ. 2020-11-28T07:45:13.47 0.1 undecidable manual S 345 0.1853 117 -0.1 97
IV.CSP1.EHZ. 2020-11-28T07:45:13.02 0.3 undecidable manual P 354 0.3606 50 -0.26 68
IV.MF5.EHZ. 2020-11-28T07:45:12.39 0.1 undecidable manual P 30 0.295 50 0.23 92
IV.FDMO.HHZ. 2020-11-28T07:45:12.41 0.1 undecidable manual P 338 0.3283 50 -0.31 91
IV.NRCA.HHZ. 2020-11-28T07:45:12.04 0.1 undecidable manual S 314 0.1448 123 -0.18 96
IV.TERO.HHZ. 2020-11-28T07:45:11.54 0.1 undecidable manual P 113 0.2779 50 -0.32 91
IV.SMA1.EHZ. 2020-11-28T07:45:11.59 0.1 undecidable manual S 150 0.1178 128 0.23 97
IV.MTRA.HNZ. 2020-11-28T07:45:10.65 0.3 undecidable manual S 77 0.1061 131 -0.35 70
IV.MC2.EHZ. 2020-11-28T07:45:10.16 0.1 undecidable manual P 345 0.1853 117 -0.04 98
IV.LNSS.HHZ. 2020-11-28T07:45:10.69 0.1 undecidable manual P 231 0.205 114 0.1 97
IV.CAMP.HHZ. 2020-11-28T07:45:10.92 0.1 undecidable manual P 150 0.2266 50 -0.06 98
IV.NRCA.HHZ. 2020-11-28T07:45:09.44 0.1 undecidable manual P 314 0.1448 123 0.03 100
IV.SMA1.EHZ. 2020-11-28T07:45:09.19 0.1 undecidable manual P 150 0.1178 128 0.27 96
IV.MTRA.HNZ. 2020-11-28T07:45:08.80 0.1 undecidable manual P 77 0.1061 131 0.09 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTRA.HNE. ML:1.9 0.000862 0.38 AML other m 2020-11-28T07:45:11.33
IV.MTRA.EHE. ML:1.8 0.000842 0.38 AML other m 2020-11-28T07:45:11.34
IV.MTRA.HNN. ML:1.8 0.000659 0.44 AML other m 2020-11-28T07:45:11.43
IV.MTRA.EHN. ML:1.7 0.000604 0.42 AML other m 2020-11-28T07:45:11.43
IV.SMA1.EHN. ML:1.1 0.000142 0.86 AML other m 2020-11-28T07:45:11.66
IV.NRCA.HHE. ML:1.9 0.000775 0.16 AML other m 2020-11-28T07:45:12.21
IV.NRCA.HNE. ML:1.9 0.000699 0.14 AML other m 2020-11-28T07:45:12.22
IV.SMA1.EHE. ML:1.1 0.000136 0.2 AML other m 2020-11-28T07:45:12.46
IV.NRCA.HHN. ML:2 0.000969 1.4 AML other m 2020-11-28T07:45:12.21
IV.NRCA.HNN. ML:2 0.0008985 1.4 AML other m 2020-11-28T07:45:12.21
IV.LNSS.HHE. ML:1.4 0.0001645 0.96 AML other m 2020-11-28T07:45:15.50
IV.LNSS.HHN. ML:1.4 0.0001475 0.92 AML other m 2020-11-28T07:45:15.56
IV.TERO.HHE. ML:1.3 9.09E-5 0.84 AML other m 2020-11-28T07:45:17.59
IV.TERO.HHN. ML:1.3 9.24E-5 1.16 AML other m 2020-11-28T07:45:17.59
IV.FDMO.HHN. ML:1 3.605E-5 0.42 AML other m 2020-11-28T07:45:18.90
IV.FDMO.HHE. ML:1 3.64E-5 0.16 AML other m 2020-11-28T07:45:20.21
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download