Earthquake with magnitude of ML 1.6 on date 31-08-2021 and time 07:03:42 (Italy) in region Costa Calabra sud occidentale (Catanzaro, Vibo Valentia, Reggio di Calabria)

A magnitude ML 1.6 earthquake occured in region: Costa Calabra sud occidentale (Catanzaro, Vibo Valentia, Reggio di Calabria), on

  • 31-08-2021 05:03:42 (UTC)
  • 31-08-2021 07:03:42 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 38.677, 15.648 at 54 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Ricadi VV 20 4900 4900

Municipalities with at least 50000 inhabitants

An earthquake occurred to
54 Km N of Messina (238439 inhabitants)
63 Km N of Reggio di Calabria (183035 inhabitants)
67 Km SW of Lamezia Terme (70714 inhabitants)
86 Km W of Catanzaro (90612 inhabitants)
86 Km SW of Cosenza (67546 inhabitants)
Recent and historical seismicity
Seismic hazard
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire ( that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
ML 1.6 2021-08-31
38.6772 15.6482 54 2021-08-31
Sala Sismica INGV-Roma 94851121
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 2021-08-31 05:03:42 ± 0.3
Latitude 38.6772 ± 0.0288
Longitude 15.6482 ± 0.0507
Depth (km) 54 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 94851121


Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 5100
Semi-minor axis of confidence ellipse (meter) 1970
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 303
Circular confidence region, given by single value of horizontal uncertainty (meter) 5100
Confidence level of the uncertainty (%) 68


Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 196
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 7
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.29
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.68259
Number of stations at which the event was observed 20
Number of stations from which data was used for origin computation 6
Magnitude information


Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 94851121
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-31 05:13:17
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.NDIM.HNZ. 2021-08-31T05:05:03.13 3.0 positive manual Pn -1.1 0
IV.PE3.EHZ. 2021-08-31T05:04:59.10 3.0 undecidable manual Pg 15.72 0
IV.FDMO.HHZ. 2021-08-31T05:04:49.87 3.0 undecidable manual Pg 16.41 0
IV.MMO1.EHZ. 2021-08-31T05:04:42.50 3.0 negative manual Pg 11.49 0
IV.CPTP.HHZ. 2021-08-31T05:04:28.71 3.0 undecidable manual Sn -6.47 0
IV.GUAR.HHZ. 2021-08-31T05:04:20.83 3.0 negative manual Pn 1.73 0
MN.VAE.HHZ. 2021-08-31T05:04:04.20 3.0 undecidable manual Pn 2.06 0
IV.MPNC.HHZ. 2021-08-31T05:04:04.05 0.6 undecidable manual S 204 0.5783 118 -0.71 57
IV.SSY.HHZ. 2021-08-31T05:04:02.89 3.0 positive manual Pn -0.07 0
IV.LADO.EHZ. 2021-08-31T05:03:58.07 3.0 undecidable manual Pn -0.41 0
IV.CELI.HHZ. 2021-08-31T05:03:57.02 3.0 negative manual Pn 0.38 0
IV.PIPA.HHZ. 2021-08-31T05:03:57.95 3.0 positive manual Pn -0.24 0
IV.MTTG.HHZ. 2021-08-31T05:03:57.10 0.6 undecidable manual P 177 0.6745 113 0.47 61
IV.PLAC.HHZ. 2021-08-31T05:03:56.73 1.0 positive manual P 110 0.6583 114 0.32 32
IV.SELL.HHZ. 2021-08-31T05:03:56.62 3.0 undecidable manual P 0.18 0
IV.SOI.EHZ. 2021-08-31T05:03:56.85 1.0 negative manual P 152 0.6826 113 0.13 33
IV.MPNC.HHZ. 2021-08-31T05:03:55.46 1.0 undecidable manual P 204 0.5783 118 0.04 34
IV.SPS2.HHZ. 2021-08-31T05:03:55.60 3.0 positive manual Pn -0.15 0
IV.GIZZ.HHZ. 2021-08-31T05:03:54.66 0.3 positive manual P 55 0.5306 121 -0.19 100
IV.CET2.HHZ. 2021-08-31T05:03:54.04 3.0 undecidable manual Pn -1.45 0
IV.MILZ.HHZ. 2021-08-31T05:03:54.94 0.6 undecidable manual P 219 0.5207 122 0.21 67
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.JOPP.HHE. ML:1.4 5.71E-5 0.06 AML other m 2021-08-31T05:03:54.81
IV.JOPP.HHN. ML:1.4 5.69E-5 0.68 AML other m 2021-08-31T05:04:23.85
IV.SELL.HHN. ML:1.3 2.195E-5 1.58 AML other m 2021-08-31T05:04:25.87
IV.CELI.HHE. ML:1.7 3.445E-5 1.58 AML other m 2021-08-31T05:04:25.91
IV.SELL.HHE. ML:1.5 3.11E-5 0.48 AML other m 2021-08-31T05:04:27.47
IV.CELI.HHN. ML:1.6 3.0E-5 0.6 AML other m 2021-08-31T05:04:27.59
IV.LADO.EHE. ML:1.9 4.75E-5 0.44 AML other m 2021-08-31T05:04:29.12
IV.LADO.EHN. ML:1.9 4.045E-5 0.22 AML other m 2021-08-31T05:04:30.00
IV.PIPA.HHN. ML:1.8 3.62E-5 0.3 AML other m 2021-08-31T05:04:30.82
IV.PIPA.HHE. ML:1.9 3.91E-5 0.64 AML other m 2021-08-31T05:04:31.74
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download