diff --git a/include/h5geo/h5seis.h b/include/h5geo/h5seis.h
index aa62222..761acdc 100644
--- a/include/h5geo/h5seis.h
+++ b/include/h5geo/h5seis.h
@@ -480,6 +480,11 @@ class H5Seis : public H5BaseObject
   /// If you plan to get `CDP-DSREG` data, you have to call H5Seis::addPKeySort("CDP") first.
   virtual bool addPKeySort(const std::string& pKeyName) = 0;
 
+  /// \brief Set trace header samp rate from binary header
+  virtual bool updateTraceHeaderSampRate() = 0;
+  /// \brief Set trace header number of samples from binary header
+  virtual bool updateTraceHeaderNSamp() = 0;
+
   /// \brief Open H5SeisContainer where current seismic resides
   virtual H5SeisContainer* openSeisContainer() = 0;
 
diff --git a/include/h5geo/private/h5seisimpl.h b/include/h5geo/private/h5seisimpl.h
index 4336afd..b6715a8 100644
--- a/include/h5geo/private/h5seisimpl.h
+++ b/include/h5geo/private/h5seisimpl.h
@@ -271,6 +271,9 @@ class H5SeisImpl : public H5BaseObjectImpl<H5Seis>
   virtual bool removePKeySort(const std::string& pKeyName) override;
   virtual bool addPKeySort(const std::string& pKeyName) override;
 
+  virtual bool updateTraceHeaderSampRate() override;
+  virtual bool updateTraceHeaderNSamp() override;
+
   virtual H5SeisContainer* openSeisContainer() override;
 
   virtual std::optional<h5gt::DataSet> getTextHeaderD() override;
diff --git a/src/h5geo/h5seisimpl.cpp b/src/h5geo/h5seisimpl.cpp
index 9a66078..788e609 100644
--- a/src/h5geo/h5seisimpl.cpp
+++ b/src/h5geo/h5seisimpl.cpp
@@ -1596,8 +1596,11 @@ bool H5SeisImpl::generatePRESTKGeometry(
           rec_z,
           orientation,
           moveRec);
-  if (status)
+  if (status){
+    this->updateTraceHeaderSampRate();
+    this->updateTraceHeaderNSamp();
     this->updateTraceHeaderLimits();
+  }
 
   return status;
 }
@@ -1656,6 +1659,8 @@ bool H5SeisImpl::generateSTKGeometry(
     this->writeTraceHeader(key, geom[key]);
 
   this->setDataType(h5geo::SeisDataType::STACK);
+  this->updateTraceHeaderSampRate();
+  this->updateTraceHeaderNSamp();
   this->updateTraceHeaderLimits();
   return true;
 }
@@ -1830,6 +1835,30 @@ bool H5SeisImpl::addPKeySort(const std::string& pKeyName){
   return true;
 }
 
+bool H5SeisImpl::updateTraceHeaderSampRate(){
+  // set sampRate
+  double sampRate = std::abs(this->getSampRate());
+  h5geo::Domain domain = this->getDomain();
+  if (domain == h5geo::Domain::TWT ||
+      domain == h5geo::Domain::OWT){
+    double tmp = std::abs(this->getSampRate("microsecond"));
+    if (!std::isnan(tmp))
+      sampRate = tmp;
+  } else if (domain == h5geo::Domain::TVD ||
+             domain == h5geo::Domain::TVDSS) {
+    double tmp = std::abs(this->getSampRate("cm"));
+    if (!std::isnan(tmp))
+      sampRate = tmp;
+  }
+  Eigen::VectorXd v = Eigen::VectorXd::Ones(this->getNTrc())*sampRate;
+  return this->writeTraceHeader("SI", v, 0);
+}
+
+bool H5SeisImpl::updateTraceHeaderNSamp(){
+  Eigen::VectorXd v = Eigen::VectorXd::Ones(this->getNTrc())*this->getNSamp();
+  return this->writeTraceHeader("NSMP", v, 0);
+}
+
 H5SeisContainer* H5SeisImpl::openSeisContainer(){
   h5gt::File file = getH5File();
   return h5geo::createSeisContainer(