Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 23-11-2018 and time 13:59:31 (Italy) in region 4 km NW Accumoli (RI)

A magnitude ML 1.8 earthquake occured in region: 4 km NW Accumoli (RI), on

  • 23-11-2018 12:59:31 (UTC)
  • 23-11-2018 13:59:31 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7260, 13.2220 at 11 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

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 8 1178 1845
Amatrice RI 12 2657 4502
Norcia PG 13 4957 9459
Cittareale RI 13 482 9941
Montegallo AP 16 523 10464
Acquasanta Terme AP 16 2916 13380
Cascia PG 17 3217 16597
Castelsantangelo sul Nera MC 20 281 16878

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km W of Teramo (54892 inhabitants)
44 Km NW of L'Aquila (69753 inhabitants)
49 Km SE of Foligno (57155 inhabitants)
50 Km E of Terni (111501 inhabitants)
80 Km W of Montesilvano (53738 inhabitants)
80 Km SE of Perugia (166134 inhabitants)
86 Km W of Pescara (121014 inhabitants)
88 Km W of Chieti (51815 inhabitants)
90 Km NE of Guidonia Montecelio (88673 inhabitants)
92 Km NE of Tivoli (56533 inhabitants)
98 Km E of Viterbo (67173 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
Bulletin
Rev1000 		ML 1.8 2018-11-23
12:59:31		 42.726 13.2225 11 2019-06-04
09:16:07		 Bollettino Sismico Italiano INGV 64839151
Reviewed
Rev100 		ML 2.2 2018-11-23
12:59:31		 42.7257 13.2205 11 2018-11-23
13:05:16		 Sala Sismica INGV-Roma 63306831
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-11-23 12:59:31 ± 0.05
Latitude 42.7260 ± 0.0027
Longitude 13.2225 ± 0.0024
Depth (km) 11 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 64839151

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 300
Semi-minor axis of confidence ellipse (meter) 220
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 351
Circular confidence region, given by single value of horizontal uncertainty (meter) 300.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 62
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.29857
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:2.2

Field Value
Value 2.2
Uncertainty 0.3
Num. used stations 20
Type of magnitude ML
Reference to an origin 63306831
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-11-23 13:05:16

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 64839151
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2019-01-21 11:43:45
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TERO.HHZ. 2018-11-23T12:59:42.44 0.3 undecidable manual S 110 33.1446 90 0.06 72
IV.RM33.EHZ. 2018-11-23T12:59:40.17 0.6 undecidable manual S 182 24.0537 90 0.2 47
IV.CAMP.HHZ. 2018-11-23T12:59:40.36 0.3 undecidable manual S 144 26.0517 90 -0.12 71
IV.GAVE.EHZ. 2018-11-23T12:59:40.70 0.6 undecidable manual S -0.01 48
IV.MC2.EHZ. 2018-11-23T12:59:39.72 0.3 undecidable manual S 352 20.7681 90 0.64 63
IV.LNSS.HHZ. 2018-11-23T12:59:38.81 0.3 undecidable manual S 227 20.1687 90 -0.12 73
IV.MMO1.EHZ. 2018-11-23T12:59:38.96 0.3 undecidable manual S 24 21.0678 90 -0.19 72
IV.NRCA.HNZ. 2018-11-23T12:59:37.14 0.3 undecidable manual S 324 14.874 90 -0.36 70
IV.MTRA.EHZ. 2018-11-23T12:59:37.25 0.3 undecidable manual S 76 14.5743 90 -0.18 72
IV.TERO.HHZ. 2018-11-23T12:59:37.49 0.1 positive manual P 110 33.1446 90 -0.12 94
IV.SMA1.EHZ. 2018-11-23T12:59:37.07 0.6 undecidable manual S 139 14.0748 91 -0.21 48
IV.CAMP.HHZ. 2018-11-23T12:59:36.47 0.1 undecidable manual P 144 26.0517 90 -0.04 97
IV.GAVE.EHZ. 2018-11-23T12:59:36.61 0.1 positive manual P -0.03 97
IV.T1299.HNZ. 2018-11-23T12:59:36.75 0.3 undecidable manual S 154 11.2776 112 0.18 73
IV.RM33.EHZ. 2018-11-23T12:59:36.19 0.3 undecidable manual P 182 24.0537 90 -0.02 74
IV.LNSS.HHZ. 2018-11-23T12:59:35.60 0.1 positive manual P 227 20.1687 90 -0.01 99
IV.MMO1.EHZ. 2018-11-23T12:59:35.77 0.1 positive manual P 24 21.0678 90 0.03 99
IV.MC2.EHZ. 2018-11-23T12:59:35.87 0.6 undecidable manual P 352 20.7681 90 0.17 48
IV.T1299.HNZ. 2018-11-23T12:59:34.47 0.1 undecidable manual P 154 11.2776 112 0.22 97
IV.SMA1.EHZ. 2018-11-23T12:59:34.72 0.3 undecidable manual P 139 14.0748 91 0.06 75
IV.NRCA.HNZ. 2018-11-23T12:59:34.74 0.1 undecidable manual P 324 14.874 90 -0.05 99
IV.MTRA.EHZ. 2018-11-23T12:59:34.77 0.1 positive manual P 76 14.5743 90 0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TERO.HHN. ML:2.3 0.0008043525499999999 0.096 AML other m 2018-11-23T12:59:42.62
IV.SMA1.EHN. ML:1.8 0.00062982485 0.2432 AML other m 2018-11-23T12:59:38.23
IV.SMA1.EHE. ML:1.9 0.0007115327499999999 0.3968 AML other m 2018-11-23T12:59:41.87
IV.MTRA.EHE. ML:2.1 0.0011101447 0.2432 AML other m 2018-11-23T12:59:37.99
IV.MTRA.EHN. ML:1.9 0.00076572965 0.16 AML other m 2018-11-23T12:59:37.66
IV.MTRA.HNE. ML:2.1 0.0011046435 0.224 AML other m 2018-11-23T12:59:37.98
IV.MTRA.HNN. ML:1.9 0.0007637056499999999 0.1728 AML other m 2018-11-23T12:59:37.65
IV.RM33.EHN. ML:1.4 0.00014266135000000002 0.1408 AML other m 2018-11-23T12:59:41.54
IV.RM33.HNN. ML:1.4 0.00015913709999999998 0.4672 AML other m 2018-11-23T12:59:47.58
IV.RM33.HNE. ML:1.4 0.00015329501 0.1088 AML other m 2018-11-23T12:59:41.03
IV.RM33.EHE. ML:1.4 0.00014698705 0.1024 AML other m 2018-11-23T12:59:40.98
IV.CAMP.HHE. ML:1.8 0.00036687685000000005 0.2624 AML other m 2018-11-23T12:59:40.47
IV.CAMP.HHN. ML:1.3 0.00010458817000000001 0.2432 AML other m 2018-11-23T12:59:40.57
IV.TERO.HNE. ML:1.6 0.00017144439 0.1344 AML other m 2018-11-23T12:59:42.69
IV.TERO.HHE. ML:2.0 0.0004692402 0.0768 AML other m 2018-11-23T12:59:42.58
IV.TERO.HNN. ML:2.0 0.0003750782 0.1024 AML other m 2018-11-23T12:59:42.63
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
Waveforms Seismic signals in miniseed + resp format Download