Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 27-09-2020 and time 05:35:45 (UTC) in region 5 km S Arquata del Tronto (AP)

A magnitude ML 1.6 earthquake occured in region: 5 km S Arquata del Tronto (AP), on

  • 27-09-2020 05:35:45 (UTC)
  • 27-09-2020 07:35:45 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7260, 13.3000 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.

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
Arquata del Tronto AP 5 1178 1178
Accumoli RI 5 667 1845
Acquasanta Terme AP 10 2916 4761
Amatrice RI 11 2657 7418
Montegallo AP 13 523 7941
Valle Castellana TE 16 977 8918
Cittareale RI 17 482 9400
Norcia PG 19 4957 14357
Rocca Santa Maria TE 19 537 14894
Campotosto AQ 20 542 15436
Montemonaco AP 20 604 16040

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km W of Teramo (54892 inhabitants)
42 Km N of L'Aquila (69753 inhabitants)
55 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 NW of Chieti (51815 inhabitants)
86 Km SE of Perugia (166134 inhabitants)
93 Km NE of Guidonia Montecelio (88673 inhabitants)
94 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
Bulletin
Rev1000 		ML 1.6 2020-09-27
05:35:45		 42.7258 13.3003 12 2021-02-26
14:56:01		 Bollettino Sismico Italiano INGV 84232681
Reviewed
Rev100 		ML 1.7 2020-09-27
05:35:45		 42.7267 13.2818 10 2020-09-27
05:42:48		 Sala Sismica INGV-Roma 83290541
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-27 05:35:45 ± 0.06
Latitude 42.7258 ± 0.0027
Longitude 13.3003 ± 0.0061
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 84232681

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 474
Semi-minor axis of confidence ellipse (meter) 166
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 262
Circular confidence region, given by single value of horizontal uncertainty (meter) 470.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 78
Number of associated phases, regardless of their use for origin computation 40
Number of defining phases 32
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.47664
Number of stations at which the event was observed 25
Number of stations from which data was used for origin computation 18
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 21
Type of magnitude ML
Reference to an origin 84232681
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-10-29 08:19:06

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 83290541
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-27 05:42:48
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FIR.HHZ. 2020-09-27T05:36:41.85 3.0 undecidable manual Sg 2.41 0
IV.SACS.HHZ. 2020-09-27T05:36:17.53 3.0 undecidable manual Sg 0.13 0
IV.PTRJ.HNZ. 2020-09-27T05:36:13.61 3.0 undecidable manual Sn -0.06 0
IV.FIR.HHZ. 2020-09-27T05:36:08.77 3.0 undecidable manual Pn -3.51 0
IV.LAV9.HHZ. 2020-09-27T05:36:04.19 3.0 undecidable manual Sn -2.21 0
IV.CESI.HHZ. 2020-09-27T05:36:00.19 0.6 undecidable manual S 314 44.622 92 0.17 46
IV.CSP1.EHZ. 2020-09-27T05:35:59.23 0.6 undecidable manual S 349 41.3253 92 0.1 47
IV.FDMO.HHZ. 2020-09-27T05:35:58.29 0.6 undecidable manual S 333 38.5281 92 -0.1 47
IV.MF5.EHZ. 2020-09-27T05:35:57.38 0.6 undecidable manual S 24 31.8459 93 0.79 39
IV.GIGS.HHN. 2020-09-27T05:35:57.72 0.1 undecidable manual S 144 37.5291 92 -0.4 88
IV.EL6.EHZ. 2020-09-27T05:35:55.93 3.0 undecidable manual Pn -0.9 0
IV.FIAM.HNN. 2020-09-27T05:35:55.75 0.3 undecidable manual P 196 52.9026 91 0.53 64
IV.LNSS.HHZ. 2020-09-27T05:35:54.87 0.6 undecidable manual S 237 25.2525 95 0.03 49
IV.RM33.HNE. 2020-09-27T05:35:54.76 0.1 undecidable manual S 196 25.0527 95 -0.03 97
IV.MC2.EHZ. 2020-09-27T05:35:54.15 0.6 undecidable manual S 336 22.4553 96 0.04 49
IV.MNTT.EHZ. 2020-09-27T05:35:54.56 0.6 undecidable manual P 33 44.3223 92 0.67 40
IV.CAMP.HHE. 2020-09-27T05:35:54.03 0.1 undecidable manual S 157 22.8549 96 -0.18 95
IV.CESI.HHZ. 2020-09-27T05:35:53.72 0.1 undecidable manual P 314 44.622 92 -0.22 91
IV.OFFI.HHZ. 2020-09-27T05:35:53.86 1.0 undecidable manual P 53 39.0276 92 0.79 19
IV.MMO1.EHZ. 2020-09-27T05:35:53.07 0.6 undecidable manual S 6 19.3695 99 -0.21 48
IV.CSP1.EHZ. 2020-09-27T05:35:53.27 0.3 negative manual P 349 41.3253 92 -0.16 70
IV.GIGS.HHN. 2020-09-27T05:35:52.74 0.3 undecidable manual P 144 37.5291 92 -0.1 71
IV.LRP.EHZ. 2020-09-27T05:35:52.89 3.0 negative manual Pn 2.1 0
IT.MTCL.HGZ. 2020-09-27T05:35:52.68 0.1 undecidable manual P 321 38.5281 92 -0.31 90
IV.NRCA.HNZ. 2020-09-27T05:35:52.90 0.6 undecidable manual S 308 19.2696 99 -0.36 46
IV.MF5.EHZ. 2020-09-27T05:35:52.31 1.0 negative manual P 24 31.8459 93 0.35 23
IV.FDMO.HHZ. 2020-09-27T05:35:52.71 0.6 positive manual P 333 38.5281 92 -0.29 45
IV.T1299.HNN. 2020-09-27T05:35:51.34 0.1 undecidable manual S 188 10.2786 126 0.32 95
IV.RM33.HNE. 2020-09-27T05:35:51.25 0.3 undecidable manual P 196 25.0527 95 0.33 70
IV.SMA1.EHZ. 2020-09-27T05:35:50.75 0.6 undecidable manual S 165 10.9779 123 -0.42 46
IV.MC2.EHZ. 2020-09-27T05:35:50.48 0.3 positive manual P 336 22.4553 96 -0.05 74
IV.CAMP.HHE. 2020-09-27T05:35:50.48 0.3 undecidable manual P 157 22.8549 96 -0.11 72
IV.LNSS.HHZ. 2020-09-27T05:35:50.88 0.1 undecidable manual P 237 25.2525 95 -0.07 97
IV.MTRA.EHZ. 2020-09-27T05:35:50.52 0.6 undecidable manual S 66 8.5803 133 -0.15 50
IV.NRCA.HNZ. 2020-09-27T05:35:49.88 0.1 positive manual P 308 19.2696 99 -0.16 96
IV.T1299.HNN. 2020-09-27T05:35:49.03 0.1 undecidable manual P 188 10.2786 126 0.28 96
IV.MMO1.EHZ. 2020-09-27T05:35:49.96 0.6 undecidable manual P 6 19.3695 99 -0.09 49
IV.MTRA.EHZ. 2020-09-27T05:35:48.59 0.1 undecidable manual P 66 8.5803 133 0.05 100
IV.SMA1.EHZ. 2020-09-27T05:35:48.97 0.1 undecidable manual P 165 10.9779 123 0.14 99
IV.TERO.HHZ. 2020-09-27T05:35:48.16 3.0 undecidable manual P 0.35 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HNE. ML:1.8 0.0005340000000000001 1.86 AML other m 2020-09-27T05:35:52.98
IV.NRCA.HHE. ML:1.9 0.00061 1.86 AML other m 2020-09-27T05:35:52.05
IV.TERO.HHN. ML:1.5 0.0001694357 0.08 AML other m 2020-09-27T05:35:55.17
IV.TERO.HNE. ML:1.7 0.0002568739 0.0672 AML other m 2020-09-27T05:35:55.35
IV.TERO.HNN. ML:1.5 0.0001627498 0.08 AML other m 2020-09-27T05:35:55.17
IV.TERO.HHE. ML:1.6 0.0002227153 0.0608 AML other m 2020-09-27T05:35:55.38
IV.MTRA.HNN. ML:1.7 0.0006896207 0.1088 AML other m 2020-09-27T05:35:50.59
IV.MTRA.EHN. ML:1.8 0.0007031466 0.1216 AML other m 2020-09-27T05:35:50.59
IV.MTRA.EHE. ML:1.9 0.0009640735 0.0608 AML other m 2020-09-27T05:35:50.62
IV.MTRA.HNE. ML:1.9 0.0009390947999999999 0.0704 AML other m 2020-09-27T05:35:50.62
IV.SMA1.EHN. ML:1.8 0.00065169115 0.1824 AML other m 2020-09-27T05:35:51.31
IV.SMA1.EHE. ML:1.6 0.0004494664 0.1216 AML other m 2020-09-27T05:35:51.39
IV.NRCA.HHN. ML:1.8 0.0005259055000000001 0.1184 AML other m 2020-09-27T05:35:53.12
IV.NRCA.HNN. ML:1.8 0.00052546175 0.128 AML other m 2020-09-27T05:35:53.12
IV.LNSS.HHE. ML:1.3 0.0001216113 0.0992 AML other m 2020-09-27T05:35:55.12
IV.LNSS.HHN. ML:1.5 0.00017049924999999999 0.2624 AML other m 2020-09-27T05:35:55.09
IV.FDMO.HHE. ML:1.1 0.000047002585 0.2016 AML other m 2020-09-27T05:35:59.65
IV.FDMO.HHN. ML:1.3 0.000074958385 0.2016 AML other m 2020-09-27T05:35:58.51
IV.CSP1.EHN. ML:1.5 0.00009791462000000001 0.2592 AML other m 2020-09-27T05:35:59.37
IV.CESI.HHE. ML:1.3 0.00005524966 0.2016 AML other m 2020-09-27T05:36:02.39
IV.CESI.HHN. ML:1.5 0.00009160166 0.1408 AML other m 2020-09-27T05:36:00.83
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