Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 20-04-2019 and time 19:40:52 (Italy) in region 3 km SE Accumoli (RI)

A magnitude ML 1.6 earthquake occured in region: 3 km SE Accumoli (RI), on

  • 20-04-2019 17:40:52 (UTC)
  • 20-04-2019 19:40:52 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6700, 13.2710 at 12 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.

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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
Amatrice RI 5 2657 3324
Cittareale RI 11 482 3806
Arquata del Tronto AP 12 1178 4984
Campotosto AQ 15 542 5526
Acquasanta Terme AP 16 2916 8442
Montereale AQ 16 2581 11023
Capitignano AQ 17 665 11688
Norcia PG 20 4957 16645
Montegallo AP 20 523 17168

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km W of Teramo (54892 inhabitants)
37 Km N of L'Aquila (69753 inhabitants)
52 Km E of Terni (111501 inhabitants)
56 Km SE of Foligno (57155 inhabitants)
74 Km W of Montesilvano (53738 inhabitants)
81 Km W of Pescara (121014 inhabitants)
82 Km W of Chieti (51815 inhabitants)
87 Km NE of Guidonia Montecelio (88673 inhabitants)
87 Km SE of Perugia (166134 inhabitants)
88 Km NE of Tivoli (56533 inhabitants)
100 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 1.6 2019-04-20
17:40:52		 42.6698 13.2707 12 2019-08-22
08:25:05		 Bollettino Sismico Italiano INGV 69761981
Reviewed
Rev100 		ML 1.5 2019-04-20
17:40:52		 42.6705 13.2737 12 2019-04-20
17:47:47		 Sala Sismica INGV-Roma 67791761
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2019-04-20 17:40:52 ± 0.04
Latitude 42.6698 ± 0.0018
Longitude 13.2707 ± 0.0037
Depth (km) 12 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 69761981

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 251
Semi-minor axis of confidence ellipse (meter) 165
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 258
Circular confidence region, given by single value of horizontal uncertainty (meter) 250.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 54
Number of associated phases, regardless of their use for origin computation 37
Number of defining phases 32
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.57647
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 19
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 26
Type of magnitude ML
Reference to an origin 67791761
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2019-04-20 17:47:47

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 28
Type of magnitude ML
Reference to an origin 69761981
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2019-06-21 10:18:59
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2019-04-20T17:41:08.01 0.3 undecidable manual S 354 47.1195 91 0.34 67
IV.FIAM.HHZ. 2019-04-20T17:41:07.55 0.3 undecidable manual S 196 46.3203 91 0.09 70
IV.FDMO.HHZ. 2019-04-20T17:41:06.94 0.3 undecidable manual S 340 43.3233 92 0.28 68
IV.T0110.HHZ. 2019-04-20T17:41:03.92 0.6 undecidable manual P 140 63.9915 91 0 46
IV.GAVE.EHZ. 2019-04-20T17:41:03.30 0.3 undecidable manual S 275 30.8469 93 -0.02 73
IV.MGR.HHZ. 2019-04-20T17:41:03.60 3.0 undecidable manual Pn -2.15 0
IV.VCEL.EHZ. 2019-04-20T17:41:03.10 0.3 undecidable manual P 123 55.6998 91 0.46 64
IV.TERO.HHZ. 2019-04-20T17:41:02.20 0.3 undecidable manual S 101 27.6501 93 -0.29 70
IV.MNTT.EHZ. 2019-04-20T17:41:02.96 3.0 undecidable manual P 0
IV.CSP1.EHZ. 2019-04-20T17:41:01.32 0.3 undecidable manual P 354 47.1195 91 0 71
IV.CESI.HHZ. 2019-04-20T17:41:01.19 0.3 undecidable manual P 321 47.619 91 -0.2 69
IV.FIAM.HHZ. 2019-04-20T17:41:01.12 0.6 undecidable manual P 196 46.3203 91 -0.07 47
IV.MMO1.EHZ. 2019-04-20T17:41:01.97 0.3 undecidable manual S 10 25.8519 94 -0.04 74
IV.NRCA.HHZ. 2019-04-20T17:41:00.71 0.3 undecidable manual S 325 22.1556 95 -0.31 70
IV.MF5.EHZ. 2019-04-20T17:41:00.59 3.0 positive manual Pn 0.99 0
IV.ARRO.EHZ. 2019-04-20T17:41:00.50 0.3 undecidable manual P 256 42.4242 92 -0.09 71
IV.LNSS.HHZ. 2019-04-20T17:41:00.48 0.3 undecidable manual S 249 20.1687 97 -0.02 75
IV.FDMO.HHZ. 2019-04-20T17:41:00.61 0.3 undecidable manual P 340 43.3233 92 -0.12 71
IV.GIGS.HHZ. 2019-04-20T17:40:59.14 0.3 undecidable manual P 134 34.4433 92 -0.23 71
IV.CAMP.HHZ. 2019-04-20T17:40:59.88 0.3 undecidable manual S 143 18.6702 98 -0.22 72
IV.RM33.EHZ. 2019-04-20T17:40:59.92 0.3 undecidable manual S 194 18.4704 99 -0.11 74
IV.MTRA.EHZ. 2019-04-20T17:40:58.69 0.3 undecidable manual S 47 14.0748 109 -0.21 72
IV.MMO1.EHZ. 2019-04-20T17:40:58.12 0.1 undecidable manual P 10 25.8519 94 0.08 98
IV.TERO.HHZ. 2019-04-20T17:40:58.29 0.1 undecidable manual P 101 27.6501 93 -0.04 99
IV.LAV9.HHZ. 2019-04-20T17:40:58.05 3.0 negative manual Pn 1.8 0
IV.GAVE.EHZ. 2019-04-20T17:40:58.77 0.3 undecidable manual P 275 30.8469 93 -0.04 73
IV.MC2.EHZ. 2019-04-20T17:40:58.23 0.3 undecidable manual P 346 27.6501 93 -0.08 73
IV.LNSS.HHZ. 2019-04-20T17:40:57.25 0.1 positive manual P 249 20.1687 97 0.07 99
IV.NRCA.HHZ. 2019-04-20T17:40:57.42 0.1 undecidable manual P 325 22.1556 95 -0.06 99
IV.CAMP.HHZ. 2019-04-20T17:40:57.02 0.1 negative manual P 143 18.6702 98 0.08 99
IV.SMA1.EHZ. 2019-04-20T17:40:57.23 0.3 undecidable manual S 130 6.8931 141 -0.09 74
IV.RM33.EHZ. 2019-04-20T17:40:57.07 0.3 undecidable manual P 194 18.4704 99 0.17 73
IV.T1299.HNZ. 2019-04-20T17:40:56.82 0.3 undecidable manual S 167 4.0959 156 -0.11 74
IV.MTRA.EHZ. 2019-04-20T17:40:56.32 0.1 positive manual P 47 14.0748 109 0.07 100
IV.SMA1.EHZ. 2019-04-20T17:40:55.57 0.1 negative manual P 130 6.8931 141 0.23 99
IV.T1299.HNZ. 2019-04-20T17:40:55.34 0.1 undecidable manual P 167 4.0959 156 0.22 99
IV.PTRJ.HNZ. 2019-04-20T17:40:49.36 3.0 undecidable manual P 0.32 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHE. ML:1.7 0.00063639995 0.1408 AML other m 2019-04-20T17:40:57.41
IV.SMA1.EHN. ML:1.8 0.00081392245 0.1408 AML other m 2019-04-20T17:40:57.35
IV.MTRA.HNN. ML:1.5 0.0003154533 0.1792 AML other m 2019-04-20T17:40:59.07
IV.MTRA.EHE. ML:1.3 0.0001968478 0.128 AML other m 2019-04-20T17:40:59.30
IV.MTRA.EHN. ML:1.6 0.0003291836 0.1792 AML other m 2019-04-20T17:40:59.07
IV.MTRA.HNE. ML:1.3 0.00018370698999999998 0.1152 AML other m 2019-04-20T17:40:59.30
IV.RM33.HNN. ML:1.5 0.0002365669 0.1152 AML other m 2019-04-20T17:41:00.72
IV.RM33.EHE. ML:1.4 0.00018266749999999997 0.2816 AML other m 2019-04-20T17:41:01.71
IV.RM33.EHN. ML:1.5 0.00023171175 0.1152 AML other m 2019-04-20T17:41:00.66
IV.RM33.HNE. ML:1.4 0.00021036834 0.448 AML other m 2019-04-20T17:41:02.98
IV.LNSS.HNE. ML:1.6 0.0003070267 0.1408 AML other m 2019-04-20T17:41:00.89
IV.LNSS.HHE. ML:1.6 0.00031123425 0.1152 AML other m 2019-04-20T17:41:00.82
IV.LNSS.HHN. ML:1.7 0.00036219765000000003 0.3328 AML other m 2019-04-20T17:41:00.77
IV.LNSS.HNN. ML:1.7 0.00038182315 0.3328 AML other m 2019-04-20T17:41:00.93
IV.NRCA.HNE. ML:1.8 0.0003915497 0.1152 AML other m 2019-04-20T17:41:01.19
IV.NRCA.HHE. ML:1.8 0.00044139399999999996 0.1152 AML other m 2019-04-20T17:41:01.19
IV.NRCA.HHN. ML:1.6 0.00025569255000000004 0.1024 AML other m 2019-04-20T17:41:01.13
IV.NRCA.HNN. ML:1.6 0.00026321605 0.9856 AML other m 2019-04-20T17:41:01.63
IV.TERO.HHE. ML:1.6 0.0001778401 0.064 AML other m 2019-04-20T17:41:02.32
IV.TERO.HNN. ML:1.9 0.0004358503 1.2032 AML other m 2019-04-20T17:41:02.85
IV.TERO.HHN. ML:1.7 0.00024746635 0.1664 AML other m 2019-04-20T17:41:03.15
IV.TERO.HNE. ML:2.0 0.0005064223999999999 0.8192 AML other m 2019-04-20T17:41:02.74
IV.GAVE.HNE. ML:1.6 0.000190935965 0.2816 AML other m 2019-04-20T17:41:04.79
IV.GAVE.EHN. ML:1.8 0.00030413645 0.2176 AML other m 2019-04-20T17:41:03.51
IV.GAVE.HNN. ML:1.6 0.0001773846 0.8192 AML other m 2019-04-20T17:41:13.57
IV.GAVE.EHE. ML:1.6 0.0001969992 0.1792 AML other m 2019-04-20T17:41:04.07
IV.CSP1.EHN. ML:1.3 0.00004982555 0.2304 AML other m 2019-04-20T17:41:08.25
IV.CSP1.EHE. ML:1.2 0.000043217384999999996 0.3968 AML other m 2019-04-20T17:41:08.20
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