Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 18-07-2020 and time 23:29:00 (Italy) in region Tirreno Settentrionale (MARE)

A magnitude ML 1.3 earthquake occured in region: Tirreno Settentrionale (MARE), on

  • 18-07-2020 21:29:00 (UTC)
  • 18-07-2020 23:29:00 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.8850, 9.8210 at 26 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

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

No Italian municipalities within 100 km from the epicenter with at least 50000 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 1.3 2020-07-18
21:29:00		 41.8853 9.8212 26 2020-11-19
12:37:02		 Bollettino Sismico Italiano INGV 83103081
Reviewed
Rev100 		ML 1.3 2020-07-18
21:29:01		 41.8878 9.7595 37 2020-07-18
21:41:27		 Sala Sismica INGV-Roma 81143351
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-07-18 21:29:00 ± 0.22
Latitude 41.8853 ± 0.0126
Longitude 9.8212 ± 0.0205
Depth (km) 26 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 83103081

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1384
Semi-minor axis of confidence ellipse (meter) 1238
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 151
Circular confidence region, given by single value of horizontal uncertainty (meter) 1380.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 131
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.51
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.46589
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 7
Type of magnitude ML
Reference to an origin 81143351
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-07-18 21:41:27

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 7
Type of magnitude ML
Reference to an origin 83103081
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-09-21 13:10:33
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ROSPO.HHZ. 2020-07-18T21:30:46.48 3.0 undecidable manual Sn 1.84 0
IV.MBAL.EHZ. 2020-07-18T21:30:46.98 3.0 undecidable manual Sn -0.05 0
CR.STON.BHZ. 2020-07-18T21:30:31.36 3.0 negative manual Pn 3.77 0
IV.SARZ.HHZ. 2020-07-18T21:30:27.58 3.0 undecidable manual Sn 0.31 0
IV.CMPR.HHZ. 2020-07-18T21:30:15.44 3.0 positive manual Pg 8.29 0
IV.FIR.HHZ. 2020-07-18T21:29:41.08 3.0 undecidable manual Pg 4.83 0
IV.CASP.HHZ. 2020-07-18T21:29:37.38 0.6 undecidable manual S 40 131.9679 54 -1.12 34
RD.PGF.BHZ. 2020-07-18T21:29:30.03 0.3 undecidable manual S 318 99.8223 100 -0.33 74
IV.CELB.HHZ. 2020-07-18T21:29:29.36 0.3 undecidable manual S 18 100.7214 100 -1.24 53
IV.AGLI.HHE. 2020-07-18T21:29:29.19 0.3 undecidable manual S 213 99.9222 100 -1.19 52
IV.SENA.HHZ. 2020-07-18T21:29:26.42 0.3 undecidable manual P 191 162.7149 54 -0.03 66
FR.AJAC.HHE.00 2020-07-18T21:29:26.18 0.6 undecidable manual S 273 87.4458 101 -0.94 41
IV.TRIF.CHZ. 2020-07-18T21:29:26.95 0.3 undecidable manual P 33 162.5151 54 0.53 59
IV.CASP.HHZ. 2020-07-18T21:29:22.85 0.1 undecidable manual P 40 131.9679 54 0.23 94
Z3.A317A.HHE. 2020-07-18T21:29:21.75 0.6 undecidable manual P 1 129.1707 54 -0.53 44
IV.MAON.HHE. 2020-07-18T21:29:21.84 0.3 undecidable manual P 60 123.3876 98 0.33 70
IV.AGLI.HHE. 2020-07-18T21:29:18.19 0.1 undecidable manual P 213 99.9222 100 0.26 100
RD.PGF.BHZ. 2020-07-18T21:29:18.83 0.1 undecidable manual P 318 99.8223 100 0.91 79
IV.CELB.HHZ. 2020-07-18T21:29:18.09 0.3 undecidable manual P 18 100.7214 100 0.04 77
FR.SMPL.HHZ.00 2020-07-18T21:29:17.58 0.3 undecidable manual S 298 49.9167 111 0.13 84
FR.AJAC.HHE.00 2020-07-18T21:29:16.18 0.3 undecidable manual P 273 87.4458 101 0.13 78
FR.SMPL.HHZ.00 2020-07-18T21:29:11.04 0.1 negative manual P 298 49.9167 111 0.57 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
FR.SMPL.HHE.00 ML:1.2 0.00003464166 0.32 AML other m 2020-07-18T21:29:18.68
FR.SMPL.HHN.00 ML:1.0 0.000027259835000000002 0.32 AML other m 2020-07-18T21:29:19.79
IV.CELB.HHN. ML:1.2 0.000016653083 0.064 AML other m 2020-07-18T21:29:30.62
IV.CELB.HHE. ML:1.5 0.00002873707 0.0512 AML other m 2020-07-18T21:29:30.72
RD.PGF.BHE. ML:1.7 0.000046610955 0.4736 AML other m 2020-07-18T21:29:31.76
RD.PGF.BHN. ML:1.5 0.000027916095 0.2432 AML other m 2020-07-18T21:29:31.72
IV.CASP.HHE. ML:0.9 0.000005113359499999999 0.1536 AML other m 2020-07-18T21:29:37.71
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