Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 22-11-2020 and time 21:35:46 (Italy) in region 5 km SW Accumoli (RI)

A magnitude ML 1.2 earthquake occured in region: 5 km SW Accumoli (RI), on

  • 22-11-2020 20:35:46 (UTC)
  • 22-11-2020 21:35:46 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.66, 13.21 at 12 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
Cittareale RI 6 482 1149
Amatrice RI 7 2657 3806
Arquata del Tronto AP 15 1178 4984
Montereale AQ 15 2581 7565
Capitignano AQ 17 665 8230
Cascia PG 17 3217 11447
Campotosto AQ 17 542 11989
Borbona RI 17 617 12606
Posta RI 18 694 13300
Norcia PG 18 4957 18257

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km NW of L'Aquila (69753 inhabitants)
41 Km W of Teramo (54892 inhabitants)
47 Km E of Terni (111501 inhabitants)
53 Km SE of Foligno (57155 inhabitants)
79 Km W of Montesilvano (53738 inhabitants)
83 Km SE of Perugia (166134 inhabitants)
83 Km NE of Guidonia Montecelio (88673 inhabitants)
84 Km NE of Tivoli (56533 inhabitants)
85 Km W of Pescara (121014 inhabitants)
86 Km W of Chieti (51815 inhabitants)
94 Km E of Viterbo (67173 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 1.2 2020-11-22
20:35:46		 42.66 13.21 12 2020-11-22
20:44:53		 Sala Sismica INGV-Roma 84952601
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-11-22 20:35:46 ± 0.07
Latitude 42.66 ± 0.00
Longitude 13.21 ± 0.00
Depth (km) 12 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 84952601

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 384
Semi-minor axis of confidence ellipse (meter) 160
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 10
Circular confidence region, given by single value of horizontal uncertainty (meter) 380
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 130
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 15
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
Epicentral distance of station farthest from the epicenter (degree) 0.29228
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 17
Type of magnitude ML
Reference to an origin 84952601
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-11-22 20:44:53
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.APEC.HHZ. 2020-11-22T20:36:23.08 3.0 undecidable manual S 0.15 0
IV.PIGN.HHZ. 2020-11-22T20:36:14.20 3.0 undecidable manual Pn -0.23 0
IV.TERO.HHZ. 2020-11-22T20:35:57.39 0.6 undecidable manual S 97 0.2923 93 -0.34 45
IV.MMO1.EHZ. 2020-11-22T20:35:56.79 0.3 undecidable manual S 20 0.2545 94 0.18 70
IV.CSP1.EHZ. 2020-11-22T20:35:55.61 3.0 negative manual P -0.2 0
IV.NRCA.HHZ. 2020-11-22T20:35:54.33 0.3 undecidable manual S 338 0.1871 97 -0.29 71
IV.ARRO.EHZ. 2020-11-22T20:35:53.76 3.0 undecidable manual P -0.19 0
IV.LNSS.HHZ. 2020-11-22T20:35:53.04 0.3 undecidable manual S 245 0.1367 107 -0.12 74
IV.MTRA.EHZ. 2020-11-22T20:35:53.90 0.3 undecidable manual S 55 0.1682 99 -0.16 72
IV.SMA1.EHZ. 2020-11-22T20:35:52.29 0.3 undecidable manual S 107 0.0971 123 0.2 73
IV.MMO1.EHZ. 2020-11-22T20:35:52.42 0.1 undecidable manual P 20 0.2545 94 0.04 97
IV.TERO.HHZ. 2020-11-22T20:35:52.88 0.1 negative manual P 97 0.2923 93 -0.14 94
IV.MC2.EHE. 2020-11-22T20:35:52.53 0.6 undecidable manual P 357 0.2518 94 0.2 47
IV.T1299.EHZ. 2020-11-22T20:35:51.11 0.3 undecidable manual S 115 0.0594 143 -0.16 74
IV.NRCA.HHZ. 2020-11-22T20:35:51.21 0.1 undecidable manual P 338 0.1871 97 -0.02 99
IV.MTRA.EHZ. 2020-11-22T20:35:50.91 0.1 positive manual P 55 0.1682 99 0 99
IV.SMA1.EHZ. 2020-11-22T20:35:50.01 0.1 positive manual P 107 0.0971 123 0.24 97
IV.LNSS.HHZ. 2020-11-22T20:35:50.42 0.1 positive manual P 245 0.1367 107 0.04 100
IV.T1299.EHZ. 2020-11-22T20:35:49.39 0.1 positive manual P 115 0.0594 143 0.09 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHE. ML:1.2 0.00017530035 0.2048 AML other m 2020-11-22T20:35:52.74
IV.SMA1.EHN. ML:1.2 0.00019470045 0.2816 AML other m 2020-11-22T20:35:52.63
IV.LNSS.HNE. ML:1.2 0.000143978475 0.2432 AML other m 2020-11-22T20:35:53.09
IV.LNSS.HNN. ML:1.3 0.0001889376425 0.2432 AML other m 2020-11-22T20:35:53.15
IV.LNSS.HHE. ML:1.2 0.00015253375 0.1152 AML other m 2020-11-22T20:35:53.32
IV.LNSS.HHN. ML:1.2 0.000128184355 0.1408 AML other m 2020-11-22T20:35:53.27
IV.MTRA.HNE. ML:1.2 0.00010980328 0.768 AML other m 2020-11-22T20:35:57.11
IV.MTRA.HNN. ML:0.9 5.9279265E-5 0.5504 AML other m 2020-11-22T20:35:55.05
IV.MTRA.EHE. ML:0.9 5.9255355E-5 0.128 AML other m 2020-11-22T20:35:53.98
IV.MTRA.EHN. ML:0.8 4.762599E-5 0.0768 AML other m 2020-11-22T20:35:54.05
IV.NRCA.HNE. ML:1.2 0.0001222487 0.1408 AML other m 2020-11-22T20:35:54.60
IV.NRCA.HNN. ML:1.5 0.0002161188 1.152 AML other m 2020-11-22T20:35:58.48
IV.NRCA.HHE. ML:1.2 0.00012089765 0.1024 AML other m 2020-11-22T20:35:55.01
IV.NRCA.HHN. ML:1.1 8.414417E-5 0.1024 AML other m 2020-11-22T20:35:54.85
IV.TERO.HHE. ML:0.9 3.3498965E-5 0.064 AML other m 2020-11-22T20:35:57.52
IV.TERO.HHN. ML:1.1 5.4344E-5 0.064 AML other m 2020-11-22T20:35:57.46
IV.TERO.HNN. ML:1.7 0.00021225885 1.1648 AML other m 2020-11-22T20:35:59.19
IV.ARRO.EHE. ML:0.6 1.4705705E-5 0.256 AML other m 2020-11-22T20:36:00.82
IV.ARRO.EHN. ML:0.4 9.2480685E-6 0.1536 AML other m 2020-11-22T20:36:00.44
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