INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of ML 2.0 on date 31-07-2018 and time 23:58:16 (Italy) in region 2 km E Sezze (LT)

A magnitude ML 2.0 earthquake occured in region: 2 km E Sezze (LT), on

  • 31-07-2018 21:58:16 (UTC)
  • 31-07-2018 23:58:16 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.51, 13.09 at 7 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
Sezze LT 2 24894 24894
Roccagorga LT 6 4591 29485
Bassiano LT 6 1583 31068
Maenza LT 8 3074 34142
Priverno LT 9 14525 48667
Sermoneta LT 10 9842 58509
Carpineto Romano RM 11 4524 63033
Roccasecca dei Volsci LT 11 1146 64179
Pontinia LT 12 14920 79099
Norma LT 13 3946 83045
Prossedi LT 15 1202 84247
Latina LT 16 125985 210232
Supino FR 16 4873 215105
Montelanico RM 16 2131 217236
Patrica FR 16 3171 220407
Giuliano di Roma FR 17 2400 222807
Sonnino LT 17 7520 230327
Gorga RM 17 710 231037
Morolo FR 17 3257 234294
Villa Santo Stefano FR 19 1720 236014
Sgurgola FR 19 2676 238690

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km E of Latina (125985 inhabitants)
32 Km SE of Velletri (53303 inhabitants)
38 Km E of Aprilia (73446 inhabitants)
39 Km E of Anzio (54211 inhabitants)
52 Km E of Pomezia (62966 inhabitants)
56 Km SE of Tivoli (56533 inhabitants)
62 Km SE of Guidonia Montecelio (88673 inhabitants)
66 Km SE of Roma (2864731 inhabitants)
76 Km E of Fiumicino (78395 inhabitants)
97 Km S of L'Aquila (69753 inhabitants)
Recent and historical Seismicity

These maps show the seismicity for different time windows. The earthquake locations reported in these maps are determined in quasi real-time by the personnel on duty in the seismic surveillance center of INGV in Rome. Note that the earthquake source parameters (hypocentral location and magnitude) are the best estimates obstained with the available data and they are adjourned as additional data become available. The source parameters obtained by the personnel on duty are then revised by the group in charge of the INGV Seismic Bulletin (Bollettino Sismico Italiano dell’INGV).

Earthquakes of the last three days (72 hours)

Earthquakes of the last three days (72 hours)

This map reports the earthquake epicenters located in the past 72 hours (3 days) from the time this page has been generated. The radius of the circle representing the earthquake on the map scales with magnitude. The color depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours). The open star shows the epicenter of the current earthquake.
Earthquakes of the last 90 days

Earthquakes of the last 90 days

This map reports the Magnitudo ≥ 1.0 earthquake epicenters located using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Earthquakes since 1985

Earthquakes since 1985

This map reports the Magnitudo ≥ 2.5 earthquake epicenters located using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2014

Earthquakes since 1000 AD until 2014

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version https://emidius.mi.ingv.it/CPTI15-DBMI15/) with estimated magnitude ≥ 5.0 since 1000 AD until 2014. The epicenters are represented by squares which sides scale with the estimated earthquake magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The open star shows the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled 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 (http://www.haisentitoilterremoto.it/) 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
Rev 100 ML 2.0 2018-07-31
21:58:16
41.51 13.09 7 2018-07-31
22:13:05
Sala Sismica INGV-Roma 59226851
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-07-31 21:58:16 ± 0.1
Latitude 41.51 ± 0.01
Longitude 13.09 ± 0.00
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 59226851

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 881
Semi-minor axis of confidence ellipse (meter) 276
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 185
Circular confidence region, given by single value of horizontal uncertainty (meter) 880
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 170
Number of associated phases, regardless of their use for origin computation 37
Number of defining phases 19
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
Epicentral distance of station farthest from the epicenter (degree) 0.56477
Number of stations at which the event was observed 28
Number of stations from which data was used for origin computation 11
Magnitude information

ML:2

Field Value
Value 2
Uncertainty 0.2
Num. used stations 36
Type of magnitude ML
Reference to an origin 59226851
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-07-31 22:06:12
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.GALF.HHZ. 2018-07-31T22:00:01.20 3.0 undecidable manual Sn -1.92 0
IV.MTGR.HHZ. 2018-07-31T21:59:56.15 3.0 undecidable manual Sn 1.47 0
AC.KBN.HHZ. 2018-07-31T21:59:50.81 3.0 negative manual Pn 7.94 0
CR.BRJN.HHZ. 2018-07-31T21:59:46.96 3.0 undecidable manual Sn -3.54 0
GU.SARM.EHZ. 2018-07-31T21:59:46.98 3.0 undecidable manual Sn -0.78 0
IV.MBAL.EHZ. 2018-07-31T21:59:38.70 3.0 undecidable manual Pg 15.16 0
MN.TRI.HHZ. 2018-07-31T21:59:29.48 3.0 undecidable manual Pg 9.49 0
IV.ARVD.HHZ. 2018-07-31T21:59:15.14 3.0 undecidable manual Sn -0.17 0
IV.LMD.HHZ. 2018-07-31T21:59:04.85 3.0 undecidable manual Pg 5.03 0
IV.MF5.EHZ. 2018-07-31T21:59:02.79 3.0 undecidable manual S -0.67 0
IV.SLCN.HHZ. 2018-07-31T21:58:52.73 3.0 positive manual Pn 0.26 0
IV.ARRO.EHZ. 2018-07-31T21:58:37.28 3.0 negative manual P 0.28 0
IV.MCI.EHZ. 2018-07-31T21:58:36.94 3.0 undecidable manual S 0.82 0
IV.VVLD.HHZ. 2018-07-31T21:58:35.35 0.3 undecidable manual S 48 0.5396 50 0 70
IV.T0110.HHZ. 2018-07-31T21:58:33.43 3.0 undecidable manual P -0.2 0
IV.RMP.HHZ. 2018-07-31T21:58:32.16 0.3 undecidable manual S 317 0.4164 50 0.46 65
IV.CERT.HHZ. 2018-07-31T21:58:32.55 0.1 undecidable manual S 350 0.447 50 -0.06 94
IV.FIAM.HHZ. 2018-07-31T21:58:31.63 3.0 negative manual P 0.35 0
IV.RCAV.EHZ. 2018-07-31T21:58:30.00 0.3 undecidable manual S 343 0.3543 50 0.14 71
IV.LRP.EHZ. 2018-07-31T21:58:30.88 0.3 undecidable manual S 70 0.3993 50 -0.31 67
IV.LIK.EHZ.01 2018-07-31T21:58:30.50 0.3 undecidable manual S 91 0.3552 50 0.63 62
IV.INTR.HHZ. 2018-07-31T21:58:30.91 3.0 undecidable manual P -1.01 0
IV.MODR.HHZ. 2018-07-31T21:58:29.50 3.0 positive manual P -0.5 0
IV.VVLD.HHZ. 2018-07-31T21:58:27.00 0.3 undecidable manual P 48 0.5396 50 -0.2 67
IV.PTQR.HHZ. 2018-07-31T21:58:27.44 0.3 undecidable manual P 24 0.5648 50 -0.18 67
IV.MCI.EHZ. 2018-07-31T21:58:27.68 3.0 negative manual P 0.41 0
IV.POFI.HHZ. 2018-07-31T21:58:26.76 0.3 negative manual P 66 0.5126 50 0.02 70
IV.CERT.HHZ. 2018-07-31T21:58:25.31 0.1 undecidable manual P 350 0.447 50 -0.3 89
IV.RMP.HHZ. 2018-07-31T21:58:25.13 0.3 undecidable manual P 317 0.4164 50 0.04 71
IV.RDP.HHE. 2018-07-31T21:58:24.30 1.0 undecidable manual P 312 0.3768 50 -0.11 24
IV.RCAV.EHZ. 2018-07-31T21:58:24.08 0.1 undecidable manual P 343 0.3543 50 0.05 96
IV.LRP.EHZ. 2018-07-31T21:58:24.48 0.1 undecidable manual P 70 0.3993 50 -0.32 90
IV.LIK.EHZ.01 2018-07-31T21:58:23.87 0.3 undecidable manual P 91 0.3552 50 -0.17 70
IV.GIUL.HHZ. 2018-07-31T21:58:21.93 0.1 undecidable manual S 68 0.1358 116 0.05 100
IV.LATB.EHZ. 2018-07-31T21:58:20.26 0.1 undecidable manual S 261 0.0935 125 -0.2 98
IV.GIUL.HHZ. 2018-07-31T21:58:19.69 0.1 negative manual P 68 0.1358 116 0.26 96
IV.LATB.EHZ. 2018-07-31T21:58:18.79 0.1 positive manual P 261 0.0935 125 0.19 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LATB.EHE. ML:1.5 0.0005215 0.6 AML other m 2018-07-31T21:58:21.63
IV.LATB.EHN. ML:1.4 0.0004015 0.44 AML other m 2018-07-31T21:58:22.26
IV.GIUL.HHN. ML:2.2 0.001755 0.5 AML other m 2018-07-31T21:58:23.37
IV.GIUL.HHE. ML:2.1 0.00138 1.28 AML other m 2018-07-31T21:58:24.75
IV.RCAV.EHN. ML:2.1 0.00042 1.46 AML other m 2018-07-31T21:58:31.92
IV.LRP.EHN. ML:1.8 0.000222 1.16 AML other m 2018-07-31T21:58:31.10
IV.RCAV.EHE. ML:1.9 0.000316 1.18 AML other m 2018-07-31T21:58:32.11
IV.LIK.EHN.01 ML:2.3 0.000708 0.44 AML other m 2018-07-31T21:58:32.82
IV.LRP.EHE. ML:2 0.0002865 1.68 AML other m 2018-07-31T21:58:33.99
IV.CERT.HHN. ML:1.9 0.00022 1.08 AML other m 2018-07-31T21:58:33.92
IV.CERT.HHE. ML:2.1 0.000318 0.96 AML other m 2018-07-31T21:58:33.39
IV.RMP.HHN. ML:2.2 0.0005 0.42 AML other m 2018-07-31T21:58:34.52
IV.RMP.HHE. ML:2 0.000305 0.7 AML other m 2018-07-31T21:58:34.60
IV.LIK.EHE.01 ML:2.2 0.0006005 0.3 AML other m 2018-07-31T21:58:35.28
IV.VVLD.HHN. ML:2 0.0001975 0.28 AML other m 2018-07-31T21:58:35.64
IV.VVLD.HHE. ML:2 0.0002025 0.34 AML other m 2018-07-31T21:58:35.82
IV.POFI.HHN. ML:1.8 0.0001319 0.16 AML other m 2018-07-31T21:58:36.40
IV.POFI.HHE. ML:1.9 0.00019 0.82 AML other m 2018-07-31T21:58:36.84
IV.PTQR.HHN. ML:1.8 0.0001265 0.16 AML other m 2018-07-31T21:58:36.93
IV.PTQR.HHE. ML:1.7 0.0001055 0.7 AML other m 2018-07-31T21:58:36.64
IV.MCI.EHE. ML:2.3 0.000429 1.6 AML other m 2018-07-31T21:58:39.08
IV.MCI.EHN. ML:2.3 0.0004085 0.22 AML other m 2018-07-31T21:58:39.48
IV.MODR.HHN. ML:1.8 8.355E-5 0.62 AML other m 2018-07-31T21:58:43.71
IV.FIAM.HHN. ML:1.8 9.17E-5 1.24 AML other m 2018-07-31T21:58:43.63
IV.MODR.HHE. ML:1.8 8.675E-5 0.88 AML other m 2018-07-31T21:58:44.00
IV.FIAM.HHE. ML:1.9 9.6E-5 0.52 AML other m 2018-07-31T21:58:48.50
IV.INTR.HHE. ML:1.6 4.98E-5 1.4 AML other m 2018-07-31T21:58:50.22
IV.INTR.HHN. ML:1.9 0.00010265 0.94 AML other m 2018-07-31T21:58:53.50
IV.T0110.HHN. ML:2 9.02E-5 1.46 AML other m 2018-07-31T21:58:54.10
IV.SLCN.HHE. ML:2.5 5.605E-5 0.24 AML other m 2018-07-31T21:58:55.02
IV.T0110.HHE. ML:1.9 7.505E-5 0.9 AML other m 2018-07-31T21:58:56.78
IV.ARRO.EHE. ML:1.8 5.125E-5 1.22 AML other m 2018-07-31T21:58:58.20
IV.ARRO.EHN. ML:1.8 4.31E-5 0.96 AML other m 2018-07-31T21:58:59.79
IV.ARVD.HHE. ML:1.8 1.555E-5 0.96 AML other m 2018-07-31T21:59:16.19
IV.ARVD.HHN. ML:1.6 1.011E-5 0.82 AML other m 2018-07-31T21:59:23.44
IV.SLCN.HHN. ML:2.4 4.865E-5 0.52 AML other m 2018-07-31T21:59:52.51
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Focal Mechanisms

Focal Mechanisms

This map reports the focal mechanisms since 1977 in the region. The white and red beach ball symbols are mechanisms determined using the Regional Centroid Moment Tensor (RCMT, http://www.bo.ingv.it/RCMT) and are determined for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when there is a good source-receiver geometry of the target earthquake, the RCMT can be obtained also for earthquakes with magnitude larger than 4.0. The blue and white beach ball symbols indicate the mechanisms obtained from application of the Time Domain Moment Tensor (TDMT, http://cnt.rm.ingv.it/tdmt.html). This technique is used for M ≥ 3.5. The size of the beach ball sysmbol scales with the calculated moment magnitude, Mw.
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 full SEED format Download