Seismic
Generation
Ass s en forr theNai m c Hazard
z rd Assessment
h Nextn at o Map

Sei
mic hazard
h zard assessmentn low
a ses me t inlo sseismicity
e smicity provinc
rovincSeismic

Tang
Ta g Aiping
A iping
t ng p@ ttangap@hit.edu.cn
SchoolInstituteiv l Engineering,ng er ng Harbin
H rInst ut of Technology
chool of Civil
T chnolog

Ou iOutline
e stated -art of Seis
ic hazard
azard assessment
ses m nt in
� Thestate-andSeismic
loeismic y pvin e in China
low seismicity
province
ew seismics m hazard
h ard assessment
ass ssment method
meth d inn lowlo� A newse
m ity province
ro cseismicity
� One
On Example
p in Yunnan
u n Province
ro cConclusions
� Coc s n

2. A new seismic
seis i hazard
a ard aassessments ess ent method
meth d iinnow sesseismicity
s i i y province-basedovi c -bas
iolow
smicityrovinc-base on deforma
deformation
aand
nd energy
en ergy accum
ulation aandnd releasing
releasingaccumulation
ittal Dynamic
D nc mec
Continental
mechanism� ConContinani� GPS dat n an
r m t andeformationand velocity
field,andfo ati
l c t fid geotectonico c o i environmentn rope e ar q ake
paleoearthquake

ollo ical
cal iino3Dimension
info
� 3Di
3Dimenon ggeological� Sitet effeeeffectionteto

lt ttypes,
p dnc anand segment
� FFault
dynamic
� Normal,o r al, rreserve
sed sstrike
i fauynd eearthquaket Tectonic
n c dynamicc andar q akeandfault,

ased ocs anc
Basedon geop
geophysics
and geoc
geochemical�Basedgeophsics
geochcal� ccomprehensive
n -greegeo-resistanceand geomagnetism,m rre een i info-gravity,-gravi y, gegeo
es s an e anm
et s abnormaln ro h m i fielde l - inert
un rt eelementl m e t anddhr
geochemical
hydrargyrum(Hg)oc deformation
eformationRock�Rock� Rocko k el
tti l tti deformation,errgy cumulationmelastic-plastics
energyefo mmat o , eenmu at oFormulationr ul on of Model
delRegional totalenergy--lithosphere orcontinental dynamicn

Heat energy--regional tectonic andvolcanism

nn

Etotal = (∑ Di (t , s)Si (t, s)) + (∑ Qi (t, s)) + ∑ cM i ( t, s) vi ( t, s)i =1

Deformation energy–regional tectonic , considering thesegmental characteristics , rock types

i =1

i =1

Kinetic energy–
tectonic activity,
including evolvement

Technique
Te ni ue Diagram
a mGeophysics

Geochemical

Fault dynamic andsegment Character.

Continental Dynamic
mechanism

Segmental fault
activity

Fault activity

Deformation and energy
accumulation and releasing

3Dimension
geological info

3. Onene example
No Ms> 60 earthquake invaded in Longmenshan fault for 2264 years, so,
it was considered a low seismicity provinceMS≥ 5.0 in Yunnan province since 624
MS ≥ 6.7 in Sichuan-Yunnan rhombic plate since
1700

Seismic
Sei i provinces
p o ncesContinental
dynamic
C tiynami

The Depth of Moho surface

Lithosphere thickness

seismic
sm c source
ou ce mechanisme a ia i l–P axial

Two preponderant
directions—NNE-NE and NWNNW—means two tectonicstress fieldeop iGeophysics
大范围为相对低
速 区 (RED),NNW
展布的长条状地壳底部明显的低速区。地震多发生于高速与低速过渡带.

Velocity structure of lithosphere and upper mantleeo- s stanceGeo-resistanceQ valueue off end-bodyend boQ值偏低且横向不均匀(transverse asymmetry) 。构造活动、高热以及低速区域的Q值低,1900年以来，云南6级以
上地震多发生在低Q值区。但龙陵一澜沧一耿马带例外，Q值高，大震频繁与新生破裂带发育有关.

Faultt characteristics
a cter s cscharacteristics
� Activity
Activity characteristics) 0 38MaB.P.
8 a . . relative
lae;
1)50
1)50一38MaB.P.
inactive
M B left-laterale t l t ra strikei e movingv ; tthe mamu displacementce n is abouto 0.8～
8 1.6kmk22)38
3 一225MaB
maximum
55MaB.P.
a . . quietude;ie
3 2 一5MaB.P.
3)25
al strike,r k , activee4)5MaB.
) Ma Right-lateral

SSegmental
gm n al charha cteristics
cte is ccharacteristics
� Segmen
he south-easternut
r part is moree active
ctiv in recent
r ce 100
1 0 yearse r1)) thell r earthquakes
a hq k s ore iin noh- e r parta iin ren decades
e de onlyl aM
7 0 tookoo2)) smaller
occurred
north-western
recentMS=7.0l e in 1925,
9 5 butt there were
we e moree 8 earthquakes
e rt ua e (MS>7.0)
MS 7 ) inn thee south-easternth e st n parts
p rt in recent
ce tplacers
100 yeyearspt3)) slippingrate
th we e : 3.5mm/a(.5a hi nt l ) ，1.6mm/a(vertical)
mm/r, Active
i iin Q
North-westernhorizontal
Q4l ( e p slip)sli ) : 3.1mm/a,3 mm/ , Active
Activ in Q3
Qmiddle(creeput e s rn :29, active
ct ve in Q3
3south-eastern::2.9mm/a,
dt y thickness:h ck
sen r centerce e moves
v towards
a s thet north-westernn h ea4)) sedimentary
sedimentarypartepove
di entary inin TTertiary
ertiary aandnd Quaternary
Quaternary period
eriod—move
Sedimentary
edimentary
period—toward north-west
no th-wes

Sedimentary thickness of Tertiary(inactive and Quaternary (active)P l s i mo ogy
Paleo-seismology

TThe fforecasting
ecasting result ofSSeismic
ismic hazad assessment
hazardhass a obvious
his ffault
obvious segmental
seg enta ccharacteristics,
ara teristics,
� TThisult haaal
h ugh then re fault
au t hash s a similars mil r tectonic
tec nic
althoughthe entire
hough
b
ckg
nd , bny diffrren
n ess iincluding
l ding sslipping
ipp n rabackgroundbutt mmany
differences
rate,,
ckgr undcluding
activity
perioddirectionlevels,riod andand stressstress d
irection aandnd levels, etc.
etc.
activity pee e will
i l be a P
A= 0.1g e
rthqu ke in n
xt 5There� TThePGA=earthquakenext
50 yearyears inthis lowo seismicity
sei mi i province
e abovebasedon ther vn e bs dobo ecomprehensive
regional
nclud n rede orm tionc m r hens ve info
n o iincluding
ion l deformation
dvveloplop n aanddee gy acc umulationm l tion andnd releasing,eg etc.
tc.
developing
energyaccumulationene
el a iing,4. Conus on
Conclusions
o iis the mostost impora t� Comprehensi
Comprehensive in
info
importantffoundation
und t on for seismics is i hazard
a ard asess ent inassessment
lowseismicity
ism c ty province
provincel w seding fault
ault system
ystem database --Including-- nc ud ng� Bui
Buildingregio
a tectonic
e to ic gelo contnent l
regionalgeology,
continental
dynamic,
a d inactive
dynamic , active
c tiv andnac ive faults
aults andhis ory earthquake
eart hquake d
at ab asehistory
database

The End
Successful Cooperation and Enjoying theeveryday in Harbin

Thanks all of you!