Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 18-08-2020 and time 17:31:09 (UTC) in region Tirreno Meridionale (MARE)

A magnitude ML 1.7 earthquake occured in region: Tirreno Meridionale (MARE), on

  • 18-08-2020 17:31:09 (UTC)
  • 18-08-2020 19:31:09 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 38.4560, 15.5400 at 75 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

An earthquake occurred to
29 Km N of Messina (238439 inhabitants)
40 Km N of Reggio di Calabria (183035 inhabitants)
89 Km SW of Lamezia Terme (70714 inhabitants)
99 Km NE of Acireale (52622 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 1.7 2020-08-18
17:31:09		 38.4562 15.5405 75 2020-11-19
12:37:01		 Bollettino Sismico Italiano INGV 82955321
Reviewed
Rev100 		ML 2.2 2020-08-18
17:31:09		 38.4532 15.5443 75 2020-08-18
17:41:15		 Sala Sismica INGV-Roma 82120611
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-08-18 17:31:09 ± 0.17
Latitude 38.4562 ± 0.0090
Longitude 15.5405 ± 0.0103
Depth (km) 75 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 82955321

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 929
Semi-minor axis of confidence ellipse (meter) 771
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 152
Circular confidence region, given by single value of horizontal uncertainty (meter) 930.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 64
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 16
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) 1.30582
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:2.2

Field Value
Value 2.2
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 82120611
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-08-18 17:41:15

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 82955321
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-09-16 13:49:08
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.GRIS.EHE. 2020-08-18T17:31:49.74 0.6 undecidable manual S 11 144.9438 109 0.06 39
IV.CAGR.HHZ. 2020-08-18T17:31:48.40 3.0 undecidable manual S -0.12 0
IV.USI.HHN. 2020-08-18T17:31:47.68 3.0 positive manual Pg 3.82 0
IV.NOV.HHZ. 2020-08-18T17:31:33.81 0.3 undecidable manual S 217 59.0964 136 0.06 71
IV.IVPL.HHZ. 2020-08-18T17:31:32.23 0.6 undecidable manual S 260 49.5171 141 -0.14 47
IV.GRIS.EHE. 2020-08-18T17:31:32.90 0.6 undecidable manual P 11 144.9438 109 0.07 40
MN.CEL.HHE. 2020-08-18T17:31:31.23 0.6 undecidable manual S 125 37.629 149 0.31 47
IV.MPNC.HHZ. 2020-08-18T17:31:30.63 0.6 undecidable manual S 205 38.0286 149 -0.33 46
IV.JOPP.HHZ. 2020-08-18T17:31:30.50 0.6 undecidable manual S 61 34.3434 152 -0.06 50
IV.CAR1.HHE. 2020-08-18T17:31:28.15 0.3 undecidable manual P 33 105.7164 117 -0.18 63
IV.NOV.HHZ. 2020-08-18T17:31:23.90 0.1 negative manual P 217 59.0964 136 0.27 91
IV.IST3.HHE. 2020-08-18T17:31:23.00 0.6 undecidable manual P 325 46.62 143 0.38 45
IV.MTTG.HHE. 2020-08-18T17:31:23.25 0.3 undecidable manual P 165 52.1034 140 0.2 70
IV.IVPL.HHZ. 2020-08-18T17:31:22.80 0.1 positive manual P 260 49.5171 141 -0.04 96
IV.IVUG.HHE. 2020-08-18T17:31:22.72 0.6 undecidable manual P 262 48.618 142 -0.05 48
MN.CEL.HHE. 2020-08-18T17:31:21.74 0.6 undecidable manual P 125 37.629 149 -0.26 47
IV.MPNC.HHZ. 2020-08-18T17:31:21.72 0.3 undecidable manual P 205 38.0286 149 -0.31 70
IV.JOPP.HHZ. 2020-08-18T17:31:21.79 0.1 positive manual P 61 34.3434 152 0 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.IVPL.HHN. ML:2.2 0.0001668839 0.704 AML other m 2020-08-18T17:31:34.85
IV.JOPP.HHE. ML:1.6 0.00014682825 0.1792 AML other m 2020-08-18T17:31:31.58
IV.IVPL.HHE. ML:1.9 0.000084415975 0.4736 AML other m 2020-08-18T17:31:32.60
IV.NOV.HHN. ML:1.6 0.000039994095000000004 0.64 AML other m 2020-08-18T17:31:34.37
IV.NOV.HHE. ML:1.7 0.00005104602 0.4736 AML other m 2020-08-18T17:31:34.59
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